diff --git a/src/python/pants/help/help_formatter_test.py b/src/python/pants/help/help_formatter_test.py
index 2af34178f9b..9c9f1519d85 100644
--- a/src/python/pants/help/help_formatter_test.py
+++ b/src/python/pants/help/help_formatter_test.py
@@ -9,8 +9,8 @@
 from pants.help.help_info_extracter import HelpInfoExtracter, OptionHelpInfo
 from pants.option.global_options import GlobalOptions
 from pants.option.native_options import NativeOptionParser
-from pants.option.parser import OptionValueHistory, Parser
 from pants.option.ranked_value import Rank, RankedValue
+from pants.option.registrar import OptionRegistrar, OptionValueHistory
 
 
 class TestOptionHelpFormatter:
@@ -58,8 +58,8 @@ def test_format_help_choices(self) -> None:
         assert default_line.lstrip() == "default: kiwi"
 
     @classmethod
-    def _get_parser(cls) -> Tuple[Parser, NativeOptionParser]:
-        return Parser(
+    def _get_registrar_and_parser(cls) -> Tuple[OptionRegistrar, NativeOptionParser]:
+        return OptionRegistrar(
             scope=GlobalOptions.options_scope,
         ), NativeOptionParser(
             args=[], env={}, config_sources=[], allow_pantsrc=False, include_derivation=True
@@ -69,36 +69,36 @@ def _get_parser(cls) -> Tuple[Parser, NativeOptionParser]:
     def _format_for_global_scope(
         cls, show_advanced: bool, show_deprecated: bool, args: list[str], kwargs
     ) -> list[str]:
-        parser, native_parser = cls._get_parser()
-        parser.register(*args, **kwargs)
+        registrar, native_parser = cls._get_registrar_and_parser()
+        registrar.register(*args, **kwargs)
         return cls._format_for_global_scope_with_parser(
-            parser, native_parser, show_advanced=show_advanced, show_deprecated=show_deprecated
+            registrar, native_parser, show_advanced=show_advanced, show_deprecated=show_deprecated
         )
 
     @classmethod
     def _format_for_global_scope_with_parser(
         cls,
-        parser: Parser,
+        registrar: OptionRegistrar,
         native_parser: NativeOptionParser,
         show_advanced: bool,
         show_deprecated: bool,
     ) -> list[str]:
         oshi = HelpInfoExtracter("").get_option_scope_help_info(
-            "", parser, native_parser, False, "help.test"
+            "", registrar, native_parser, False, "help.test"
         )
         return HelpFormatter(
             show_advanced=show_advanced, show_deprecated=show_deprecated, color=False
         ).format_options(oshi)
 
     def test_suppress_advanced(self) -> None:
-        parser, native_parser = self._get_parser()
-        parser.register("--foo", advanced=True)
+        registrar, native_parser = self._get_registrar_and_parser()
+        registrar.register("--foo", advanced=True)
         # must have a non advanced option to be able to supress showing advanced options.
-        parser.register("--jerry", advanced=False)
-        lines = self._format_for_global_scope_with_parser(parser, native_parser, False, False)
+        registrar.register("--jerry", advanced=False)
+        lines = self._format_for_global_scope_with_parser(registrar, native_parser, False, False)
         assert len(lines) == 15
         assert not any("--foo" in line for line in lines)
-        lines = self._format_for_global_scope_with_parser(parser, native_parser, True, False)
+        lines = self._format_for_global_scope_with_parser(registrar, native_parser, True, False)
         assert len(lines) == 24
 
     def test_suppress_deprecated(self) -> None:
diff --git a/src/python/pants/help/help_info_extracter.py b/src/python/pants/help/help_info_extracter.py
index 0697c952efc..d4c2b93e7ec 100644
--- a/src/python/pants/help/help_info_extracter.py
+++ b/src/python/pants/help/help_info_extracter.py
@@ -45,8 +45,8 @@
 from pants.option.native_options import NativeOptionParser, parse_dest
 from pants.option.option_util import is_dict_option, is_list_option
 from pants.option.options import Options
-from pants.option.parser import OptionValueHistory, Parser
 from pants.option.ranked_value import Rank, RankedValue
+from pants.option.registrar import OptionRegistrar, OptionValueHistory
 from pants.option.scope import GLOBAL_SCOPE, ScopeInfo
 from pants.util.frozendict import LazyFrozenDict
 from pants.util.strutil import first_paragraph, strval
@@ -508,7 +508,7 @@ def load() -> OptionScopeHelpInfo:
                     )
                 return HelpInfoExtracter(scope_info.scope).get_option_scope_help_info(
                     scope_info.description,
-                    options.get_parser(scope_info.scope),
+                    options.get_registrar(scope_info.scope),
                     options.native_parser.with_derivation(),
                     # `filter` should be treated as a subsystem for `help`, even though it still
                     # works as a goal for backwards compatibility.
@@ -1003,7 +1003,7 @@ def __init__(self, scope: str):
     def get_option_scope_help_info(
         self,
         description: str,
-        parser: Parser,
+        registrar: OptionRegistrar,
         native_parser: NativeOptionParser,
         is_goal: bool,
         provider: str = "",
@@ -1014,11 +1014,11 @@ def get_option_scope_help_info(
         basic_options = []
         advanced_options = []
         deprecated_options = []
-        for args, kwargs in parser.option_registrations_iter():
+        for args, kwargs in registrar.option_registrations_iter():
             derivation = native_parser.get_derivation(
-                scope=parser.scope, registration_args=args, registration_kwargs=kwargs
+                scope=registrar.scope, registration_args=args, registration_kwargs=kwargs
             )
-            # Massage the derivation structure returned by the NativeParser into an
+            # Massage the derivation structure returned by the NativeOptionParser into an
             # OptionValueHistory as returned by the legacy parser.
             # TODO: Once we get rid of the legacy parser we can probably simplify by
             #  using the native structure directly.
@@ -1071,7 +1071,7 @@ def get_option_help_info(self, args, kwargs):
                 scoped_arg = arg
             scoped_cmd_line_args.append(scoped_arg)
 
-            if Parser.is_bool(kwargs):
+            if OptionRegistrar.is_bool(kwargs):
                 if is_short_arg:
                     display_args.append(scoped_arg)
                 else:
diff --git a/src/python/pants/help/help_info_extracter_test.py b/src/python/pants/help/help_info_extracter_test.py
index 4fec7d68a1a..f5606a8c583 100644
--- a/src/python/pants/help/help_info_extracter_test.py
+++ b/src/python/pants/help/help_info_extracter_test.py
@@ -18,8 +18,8 @@
 from pants.option.native_options import NativeOptionParser
 from pants.option.option_types import BoolOption, IntListOption, StrListOption
 from pants.option.options import Options
-from pants.option.parser import Parser
 from pants.option.ranked_value import Rank
+from pants.option.registrar import OptionRegistrar
 from pants.option.scope import GLOBAL_SCOPE
 from pants.option.subsystem import Subsystem
 from pants.util.logging import LogLevel
@@ -98,15 +98,15 @@ def do_test(
 
 def test_default() -> None:
     def do_test(args, kwargs, expected_default_str):
-        # Defaults are computed in the parser and added into the kwargs, so we
+        # Defaults are computed in the registrar and added into the kwargs, so we
         # must jump through this hoop in this test.
-        parser = Parser(
+        registrar = OptionRegistrar(
             scope=GlobalOptions.options_scope,
         )
         native_parser = NativeOptionParser([], {}, [], allow_pantsrc=False, include_derivation=True)
-        parser.register(*args, **kwargs)
-        oshi = HelpInfoExtracter(parser.scope).get_option_scope_help_info(
-            "description", parser, native_parser, False, "provider"
+        registrar.register(*args, **kwargs)
+        oshi = HelpInfoExtracter(registrar.scope).get_option_scope_help_info(
+            "description", registrar, native_parser, False, "provider"
         )
         assert oshi.description == "description"
         assert oshi.provider == "provider"
@@ -198,11 +198,11 @@ def do_test(kwargs, expected_basic=False, expected_advanced=False):
         def exp_to_len(exp):
             return int(exp)  # True -> 1, False -> 0.
 
-        parser = Parser(scope=GlobalOptions.options_scope)
+        registrar = OptionRegistrar(scope=GlobalOptions.options_scope)
         native_parser = NativeOptionParser([], {}, [], allow_pantsrc=False, include_derivation=True)
-        parser.register("--foo", **kwargs)
+        registrar.register("--foo", **kwargs)
         oshi = HelpInfoExtracter("").get_option_scope_help_info(
-            "", parser, native_parser, False, ""
+            "", registrar, native_parser, False, ""
         )
         assert exp_to_len(expected_basic) == len(oshi.basic)
         assert exp_to_len(expected_advanced) == len(oshi.advanced)
diff --git a/src/python/pants/help/help_tools_test.py b/src/python/pants/help/help_tools_test.py
index 7aa1490bb4c..65558fdd589 100644
--- a/src/python/pants/help/help_tools_test.py
+++ b/src/python/pants/help/help_tools_test.py
@@ -11,12 +11,12 @@
 from pants.help.maybe_color import MaybeColor
 from pants.option.global_options import GlobalOptions
 from pants.option.native_options import NativeOptionParser
-from pants.option.parser import Parser
+from pants.option.registrar import OptionRegistrar
 
 
 @pytest.fixture
-def parser() -> Parser:
-    return Parser(scope=GlobalOptions.options_scope)
+def registrar() -> OptionRegistrar:
+    return OptionRegistrar(scope=GlobalOptions.options_scope)
 
 
 @pytest.fixture
@@ -30,17 +30,19 @@ def extracter() -> HelpInfoExtracter:
 
 
 @pytest.fixture
-def tool_info(extracter, parser, native_parser) -> ToolHelpInfo:
-    parser.register("--version", type=str, default="1.0")
-    parser.register("--url-template", type=str, default="https://download/{version}")
-    oshi = extracter.get_option_scope_help_info("Test description.", parser, native_parser, False)
+def tool_info(extracter, registrar, native_parser) -> ToolHelpInfo:
+    registrar.register("--version", type=str, default="1.0")
+    registrar.register("--url-template", type=str, default="https://download/{version}")
+    oshi = extracter.get_option_scope_help_info(
+        "Test description.", registrar, native_parser, False
+    )
     tool_info = ToolHelpInfo.from_option_scope_help_info(oshi)
     assert tool_info is not None
     return tool_info
 
 
-def test_no_tool_help_info(extracter, parser, native_parser) -> None:
-    oshi = extracter.get_option_scope_help_info("", parser, native_parser, False)
+def test_no_tool_help_info(extracter, registrar, native_parser) -> None:
+    oshi = extracter.get_option_scope_help_info("", registrar, native_parser, False)
     assert ToolHelpInfo.from_option_scope_help_info(oshi) is None
 
 
diff --git a/src/python/pants/option/options.py b/src/python/pants/option/options.py
index 0eae8cc5260..c7aff939ca6 100644
--- a/src/python/pants/option/options.py
+++ b/src/python/pants/option/options.py
@@ -21,8 +21,8 @@
 from pants.option.native_options import NativeOptionParser
 from pants.option.option_util import is_list_option
 from pants.option.option_value_container import OptionValueContainer, OptionValueContainerBuilder
-from pants.option.parser import Parser
 from pants.option.ranked_value import Rank, RankedValue
+from pants.option.registrar import OptionRegistrar
 from pants.option.scope import GLOBAL_SCOPE, GLOBAL_SCOPE_CONFIG_SECTION, ScopeInfo
 from pants.util.memo import memoized_method
 from pants.util.ordered_set import FrozenOrderedSet, OrderedSet
@@ -122,9 +122,6 @@ def create(
         args: Sequence[str],
         bootstrap_option_values: OptionValueContainer | None = None,
         allow_unknown_options: bool = False,
-        # We default to error to be strict in tests, but set explicitly in OptionsBootstrapper
-        # for user-facing behavior.
-        native_options_validation: NativeOptionsValidation = NativeOptionsValidation.error,
         native_options_config_discovery: bool = True,
         include_derivation: bool = False,
     ) -> Options:
@@ -137,12 +134,11 @@ def create(
         :param bootstrap_option_values: An optional namespace containing the values of bootstrap
                options. We can use these values when registering other options.
         :param allow_unknown_options: Whether to ignore or error on unknown cmd-line flags.
-        :param native_options_validation: How to validate the native options parser against the
-               legacy Python parser.
-        :param native_options_config_discovery: Whether to discover config files in the native parser or use the ones supplied
+        :param native_options_config_discovery: Whether to discover config files in the native
+            parser or use the ones supplied.
         :param include_derivation: Whether to gather option value derivation information.
         """
-        # We need parsers for all the intermediate scopes, so inherited option values
+        # We need registrars for all the intermediate scopes, so inherited option values
         # can propagate through them.
         complete_known_scope_infos = cls.complete_scopes(known_scope_infos)
         splitter = ArgSplitter(complete_known_scope_infos, get_buildroot())
@@ -170,7 +166,9 @@ def create(
                             [line for line in [line.strip() for line in f] if line]
                         )
 
-        parser_by_scope = {si.scope: Parser(si.scope) for si in complete_known_scope_infos}
+        registrar_by_scope = {
+            si.scope: OptionRegistrar(si.scope) for si in complete_known_scope_infos
+        }
         known_scope_to_info = {s.scope: s for s in complete_known_scope_infos}
 
         config_to_pass = None if native_options_config_discovery else config.sources()
@@ -190,9 +188,8 @@ def create(
             scope_to_flags=split_args.scope_to_flags,
             specs=split_args.specs,
             passthru=split_args.passthru,
-            parser_by_scope=parser_by_scope,
+            registrar_by_scope=registrar_by_scope,
             native_parser=native_parser,
-            native_options_validation=native_options_validation,
             bootstrap_option_values=bootstrap_option_values,
             known_scope_to_info=known_scope_to_info,
             allow_unknown_options=allow_unknown_options,
@@ -206,9 +203,8 @@ def __init__(
         scope_to_flags: dict[str, list[str]],
         specs: list[str],
         passthru: list[str],
-        parser_by_scope: dict[str, Parser],
+        registrar_by_scope: dict[str, OptionRegistrar],
         native_parser: NativeOptionParser,
-        native_options_validation: NativeOptionsValidation,
         bootstrap_option_values: OptionValueContainer | None,
         known_scope_to_info: dict[str, ScopeInfo],
         allow_unknown_options: bool = False,
@@ -223,7 +219,7 @@ def __init__(
         self._scope_to_flags = scope_to_flags
         self._specs = specs
         self._passthru = passthru
-        self._parser_by_scope = parser_by_scope
+        self._registrar_by_scope = registrar_by_scope
         self._native_parser = native_parser
         self._bootstrap_option_values = bootstrap_option_values
         self._known_scope_to_info = known_scope_to_info
@@ -271,7 +267,10 @@ def known_scope_to_info(self) -> dict[str, ScopeInfo]:
 
     @property
     def known_scope_to_scoped_args(self) -> dict[str, frozenset[str]]:
-        return {scope: parser.known_scoped_args for scope, parser in self._parser_by_scope.items()}
+        return {
+            scope: registrar.known_scoped_args
+            for scope, registrar in self._registrar_by_scope.items()
+        }
 
     @property
     def scope_to_flags(self) -> dict[str, list[str]]:
@@ -318,10 +317,10 @@ def is_known_scope(self, scope: str) -> bool:
 
     def register(self, scope: str, *args, **kwargs) -> None:
         """Register an option in the given scope."""
-        self.get_parser(scope).register(*args, **kwargs)
+        self.get_registrar(scope).register(*args, **kwargs)
         deprecated_scope = self.known_scope_to_info[scope].deprecated_scope
         if deprecated_scope:
-            self.get_parser(deprecated_scope).register(*args, **kwargs)
+            self.get_registrar(deprecated_scope).register(*args, **kwargs)
 
     def registration_function_for_subsystem(self, subsystem_cls):
         """Returns a function for registering options on the given scope."""
@@ -337,15 +336,15 @@ def register(*args, **kwargs):
         register.scope = subsystem_cls.options_scope
         return register
 
-    def get_parser(self, scope: str) -> Parser:
-        """Returns the parser for the given scope, so code can register on it directly.
+    def get_registrar(self, scope: str) -> OptionRegistrar:
+        """Returns the registrar for the given scope, so code can register on it directly.
 
-        :param scope: The scope to retrieve the parser for.
-        :return: The parser for the given scope.
+        :param scope: The scope to retrieve the registrar for.
+        :return: The registrar for the given scope.
         :raises pants.option.errors.ConfigValidationError: if the scope is not known.
         """
         try:
-            return self._parser_by_scope[scope]
+            return self._registrar_by_scope[scope]
         except KeyError:
             raise ConfigValidationError(f"No such options scope: {scope}")
 
@@ -418,10 +417,10 @@ def for_scope(
         """
         builder = OptionValueContainerBuilder()
         mutex_map = defaultdict(list)
-        parser = self.get_parser(scope)
+        registrar = self.get_registrar(scope)
         scope_str = "global scope" if scope == GLOBAL_SCOPE else f"scope '{scope}'"
 
-        for args, kwargs in parser.option_registrations_iter():
+        for args, kwargs in registrar.option_registrations_iter():
             dest = kwargs["dest"]
             val, rank = self._native_parser.get_value(
                 scope=scope, registration_args=args, registration_kwargs=kwargs
@@ -483,9 +482,9 @@ def get_fingerprintable_for_scope(
         """
 
         pairs = []
-        parser = self.get_parser(scope)
+        registrar = self.get_registrar(scope)
         # Sort the arguments, so that the fingerprint is consistent.
-        for _, kwargs in sorted(parser.option_registrations_iter()):
+        for _, kwargs in sorted(registrar.option_registrations_iter()):
             if not kwargs.get("fingerprint", True):
                 continue
             if daemon_only and not kwargs.get("daemon", False):
diff --git a/src/python/pants/option/options_bootstrapper.py b/src/python/pants/option/options_bootstrapper.py
index e4257d1547f..5d4eeabf73b 100644
--- a/src/python/pants/option/options_bootstrapper.py
+++ b/src/python/pants/option/options_bootstrapper.py
@@ -18,7 +18,7 @@
 from pants.option.custom_types import DictValueComponent, ListValueComponent
 from pants.option.global_options import BootstrapOptions, GlobalOptions
 from pants.option.option_types import collect_options_info
-from pants.option.options import NativeOptionsValidation, Options
+from pants.option.options import Options
 from pants.option.scope import GLOBAL_SCOPE, ScopeInfo
 from pants.option.subsystem import Subsystem
 from pants.util.dirutil import read_file
@@ -97,9 +97,6 @@ def parse_bootstrap_options(
             config=config,
             known_scope_infos=[GlobalOptions.get_scope_info()],
             args=args,
-            # We ignore validation to ensure bootstrapping succeeds.
-            # The bootstrap options will be validated anyway when we parse the full options.
-            native_options_validation=NativeOptionsValidation.ignore,
             native_options_config_discovery=False,
         )
 
@@ -259,7 +256,6 @@ def _full_options(
             args=self.args,
             bootstrap_option_values=bootstrap_option_values,
             allow_unknown_options=allow_unknown_options,
-            native_options_validation=bootstrap_option_values.native_options_validation,
             native_options_config_discovery=False,
         )
 
diff --git a/src/python/pants/option/parser.py b/src/python/pants/option/registrar.py
similarity index 96%
rename from src/python/pants/option/parser.py
rename to src/python/pants/option/registrar.py
index 4800d2c51e5..56bb2600e09 100644
--- a/src/python/pants/option/parser.py
+++ b/src/python/pants/option/registrar.py
@@ -53,8 +53,8 @@ def final_value(self) -> RankedValue:
         return self.ranked_values[-1]
 
 
-class Parser:
-    """An argument parser."""
+class OptionRegistrar:
+    """Holds information about registered options."""
 
     @staticmethod
     def is_bool(kwargs: Mapping[str, Any]) -> bool:
@@ -89,13 +89,13 @@ def _invert(cls, s: bool | str | None) -> bool | None:
         return not b
 
     def __init__(self, scope: str) -> None:
-        """Create a Parser instance.
+        """Create an OptionRegistrar instance.
 
-        :param scope: the scope this parser acts for.
+        :param scope: the scope this registrar acts for.
         """
         self._scope = scope
 
-        # All option args registered with this parser.  Used to prevent conflicts.
+        # All option args registered with this registrar.  Used to prevent conflicts.
         self._known_args: set[str] = set()
 
         # List of (args, kwargs) registration pairs, exactly as captured at registration time.
@@ -115,7 +115,7 @@ def known_scoped_args(self) -> frozenset[str]:
 
     def option_registrations_iter(self):
         """Returns an iterator over the normalized registration arguments of each option in this
-        parser.
+        registrar.
 
         Useful for generating help and other documentation.
 
@@ -308,4 +308,4 @@ def to_value_type(cls, val_str, type_arg, member_type):
             )
 
     def __str__(self) -> str:
-        return f"Parser({self.scope})"
+        return f"OptionRegistrar({self.scope})"