diff --git a/core/modules/auto_updates/auto_updates.module b/core/modules/auto_updates/auto_updates.module
index 464dbbf7c3c0e54f852454a6548ac696a587016e..77c034f61bc82da10cfbcd21332cf51a7bd7e9d9 100644
--- a/core/modules/auto_updates/auto_updates.module
+++ b/core/modules/auto_updates/auto_updates.module
@@ -109,7 +109,7 @@ function auto_updates_module_implements_alter(&$implementations, $hook) {
     unset($implementations['update']);
   }
   if ($hook === 'cron') {
-    // Whatever mofo.
+    // Whatever.
     $hook = $implementations['auto_updates'];
     unset($implementations['auto_updates']);
     $implementations['auto_updates'] = $hook;
diff --git a/core/modules/auto_updates/src/ReleaseChooser.php b/core/modules/auto_updates/src/ReleaseChooser.php
index 7fc2b66b7f68f178ac7ec36d4ccb74d76e9da638..ad19eb118df388dab19e68e273e47a3a5213f775 100644
--- a/core/modules/auto_updates/src/ReleaseChooser.php
+++ b/core/modules/auto_updates/src/ReleaseChooser.php
@@ -47,7 +47,7 @@ public function __construct(VersionPolicyValidator $version_policy_validator) {
    *   The updater that will be used to install the releases.
    *
    * @return \Drupal\update\ProjectRelease[]
-   *   The releases that are installable by the given updtaer, according to the
+   *   The releases that are installable by the given updater, according to the
    *   version validator service.
    */
   protected function getInstallableReleases(Updater $updater): array {
diff --git a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/new_project_added/active/vendor/composer/installed.json b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/new_project_added/active/vendor/composer/installed.json
index bc87d26d79de331791545809e450f502ba78e2ee..7d023c9e987ce0d5b69c8402355b2e6c5eb21431 100644
--- a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/new_project_added/active/vendor/composer/installed.json
+++ b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/new_project_added/active/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in the active directory of a virtual project.",
+    "This file simulates a list of packages installed in the active directory of a virtual project.",
     "It will be compared against staged.installed.json.",
     "See \\Drupal\\Tests\\auto_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/new_project_added/staged/vendor/composer/installed.json b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/new_project_added/staged/vendor/composer/installed.json
index a485678d2278a03642a4cd65dee6b3e66b5f5f4e..75ca62dff3f1b7e69f5ee17ec25d7a793e4ef6d3 100644
--- a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/new_project_added/staged/vendor/composer/installed.json
+++ b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/new_project_added/staged/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in a virtual staging area.",
+    "This file simulates a list of packages installed in a virtual staging area.",
     "It will be compared against active.installed.json.",
     "See \\Drupal\\Tests\\auto_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/no_errors/active/vendor/composer/installed.json b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/no_errors/active/vendor/composer/installed.json
index 4005167f65a3c6c62ab55f315c23ee0a86c657c6..1ce420f9133460f5720cdd212ad496a6dc9923f4 100644
--- a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/no_errors/active/vendor/composer/installed.json
+++ b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/no_errors/active/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in the active directory of a virtual project.",
+    "This file simulates a list of packages installed in the active directory of a virtual project.",
     "It will be compared against staged.installed.json.",
     "See \\Drupal\\Tests\\auto_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/no_errors/staged/vendor/composer/installed.json b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/no_errors/staged/vendor/composer/installed.json
index 317eff012aea8786a41e2366c137c240b34a8be8..aae27341f80d8ff5b4dc14afa10c5f4ab43c3e7b 100644
--- a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/no_errors/staged/vendor/composer/installed.json
+++ b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/no_errors/staged/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in a virtual staging area.",
+    "This file simulates a list of packages installed in a virtual staging area.",
     "It will be compared against active.installed.json.",
     "See \\Drupal\\Tests\\auto_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/project_removed/active/vendor/composer/installed.json b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/project_removed/active/vendor/composer/installed.json
index 08242008b82ceb69ee09fa92bdd67966267554da..6c78f4198c08324be34fc6d7b110882ab439d22a 100644
--- a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/project_removed/active/vendor/composer/installed.json
+++ b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/project_removed/active/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in the active directory of a virtual project.",
+    "This file simulates a list of packages installed in the active directory of a virtual project.",
     "It will be compared against staged.installed.json.",
     "See \\Drupal\\Tests\\auto_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/project_removed/staged/vendor/composer/installed.json b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/project_removed/staged/vendor/composer/installed.json
index 9e91821930a930e7d2a677ce5fef36495392d336..c7892ad9888204fb010fdff87df23e3d3adbca99 100644
--- a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/project_removed/staged/vendor/composer/installed.json
+++ b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/project_removed/staged/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in a virtual staging area.",
+    "This file simulates a list of packages installed in a virtual staging area.",
     "It will be compared against active.installed.json.",
     "See \\Drupal\\Tests\\auto_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/version_changed/active/vendor/composer/installed.json b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/version_changed/active/vendor/composer/installed.json
index b4f51c18de2bfcb7c307268ae374834fa58d046e..0f0a7d245c4ef5d0f5bbd85ad0e8a9768ff6ff67 100644
--- a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/version_changed/active/vendor/composer/installed.json
+++ b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/version_changed/active/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in the active directory of a virtual project.",
+    "This file simulates a list of packages installed in the active directory of a virtual project.",
     "It will be compared against staged.installed.json.",
     "See \\Drupal\\Tests\\auto_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/version_changed/staged/vendor/composer/installed.json b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/version_changed/staged/vendor/composer/installed.json
index 9f6db978918b353200ae4f135b9c0f637cdecf05..74fdba6a8f0271217b0d5edf79eeea6824a57287 100644
--- a/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/version_changed/staged/vendor/composer/installed.json
+++ b/core/modules/auto_updates/tests/fixtures/StagedProjectsValidatorTest/version_changed/staged/vendor/composer/installed.json
@@ -1,6 +1,6 @@
 {
   "_readme": [
-    "This file simuluates a list of packages installed in a virtual staging area.",
+    "This file simulates a list of packages installed in a virtual staging area.",
     "It will be compared against active.installed.json.",
     "See \\Drupal\\Tests\\auto_updates\\Kernel\\ReadinessValidation\\StagedProjectsValidatorTest::testErrors()"
   ],
diff --git a/core/modules/auto_updates/tests/modules/auto_updates_test/auto_updates_test.module b/core/modules/auto_updates/tests/modules/auto_updates_test/auto_updates_test.module
index 719ffea93fa7e79b44f9759591a49b3593c7d1a8..628581ca190d460b87ecf75ebf7d28af92221cc2 100644
--- a/core/modules/auto_updates/tests/modules/auto_updates_test/auto_updates_test.module
+++ b/core/modules/auto_updates/tests/modules/auto_updates_test/auto_updates_test.module
@@ -14,7 +14,7 @@ function auto_updates_test_mail_alter(array &$message): void {
   if (str_starts_with($message['id'], 'auto_updates_')) {
     $line_langcodes = [];
 
-    // Get the langcode of every translated line in the mssage, including the
+    // Get the langcode of every translated line in the message, including the
     // subject line.
     $lines = array_merge($message['body'], [
       $message['subject'],
diff --git a/core/modules/auto_updates/tests/src/Functional/UpdaterFormTest.php b/core/modules/auto_updates/tests/src/Functional/UpdaterFormTest.php
index 40e460bf9bca0244e2cedff393af76b2d638d211..c242fdfd0a58adbd28ea067e9a983eb60bbb4b44 100644
--- a/core/modules/auto_updates/tests/src/Functional/UpdaterFormTest.php
+++ b/core/modules/auto_updates/tests/src/Functional/UpdaterFormTest.php
@@ -332,7 +332,7 @@ public function testMarkerFileFailure(): void {
     $this->checkForMetaRefresh();
     $this->assertUpdateStagedTimes(1);
 
-    Committer::setException(new \Exception('failed at commiter'));
+    Committer::setException(new \Exception('failed at committer'));
     $page->pressButton('Continue');
     $this->checkForMetaRefresh();
     $assert_session->pageTextContainsOnce('An error has occurred.');
@@ -774,7 +774,7 @@ public function testNoContinueOnError(): void {
     $page->pressButton('Update to 9.8.1');
     $this->checkForMetaRefresh();
     $this->assertUpdateStagedTimes(1);
-    $error = ValidationResult::createError(['Error occured.']);
+    $error = ValidationResult::createError(['Error occurred.']);
     TestSubscriber::setTestResult([$error], StatusCheckEvent::class);
     $this->getSession()->reload();
     $assert_session->buttonNotExists('Continue');
diff --git a/core/modules/auto_updates/tests/src/Kernel/ReadinessValidation/StagedProjectsValidatorTest.php b/core/modules/auto_updates/tests/src/Kernel/ReadinessValidation/StagedProjectsValidatorTest.php
index 089cf95bb407502f70ef57168fbe1d9077605f0e..c1cc9c90ef2555307b4040ff1d61d702116fd97b 100644
--- a/core/modules/auto_updates/tests/src/Kernel/ReadinessValidation/StagedProjectsValidatorTest.php
+++ b/core/modules/auto_updates/tests/src/Kernel/ReadinessValidation/StagedProjectsValidatorTest.php
@@ -81,7 +81,7 @@ public function testEventConsumesExceptionResults(): void {
    * Tests validation errors, or lack thereof.
    *
    * @param string $root_fixture_directory
-   *   A directory containing to fixtures sub direcotories, 'active' and
+   *   A directory containing to fixtures sub-directories, 'active' and
    *   'staged'.
    * @param string|null $expected_summary
    *   The expected error summary, or NULL if no errors are expected.
diff --git a/core/modules/package_manager/package_manager.module b/core/modules/package_manager/package_manager.module
index c46e1a20983fd8d5b962dd5d6709420c958af16d..569a65cbde6cde738dc777fd636df49b4352483d 100644
--- a/core/modules/package_manager/package_manager.module
+++ b/core/modules/package_manager/package_manager.module
@@ -8,6 +8,8 @@
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\package_manager\Validator\ComposerExecutableValidator;
 
+// cspell:ignore grasmash
+
 /**
  * Implements hook_help().
  */
diff --git a/core/modules/package_manager/src/Event/RequireEventTrait.php b/core/modules/package_manager/src/Event/RequireEventTrait.php
index f93853967311871a83581ccd47c76145a72d5c2f..96d4c0d3bf2176854fc7e2a092e388baa1fc8408 100644
--- a/core/modules/package_manager/src/Event/RequireEventTrait.php
+++ b/core/modules/package_manager/src/Event/RequireEventTrait.php
@@ -35,9 +35,9 @@ trait RequireEventTrait {
    *   The stage.
    * @param string[] $runtime_packages
    *   The runtime (i.e., non-dev) packages to be required, in the form
-   *   'vendor/name:constrant'.
+   *   'vendor/name:constraint'.
    * @param string[] $dev_packages
-   *   The dev packages to be required, in the form 'vendor/name:constrant'.
+   *   The dev packages to be required, in the form 'vendor/name:constraint'.
    */
   public function __construct(Stage $stage, array $runtime_packages, array $dev_packages = []) {
     $this->runtimePackages = $runtime_packages;
diff --git a/core/modules/package_manager/src/FailureMarker.php b/core/modules/package_manager/src/FailureMarker.php
index 14b5ee90e51c75d21285857eae39cd6ec92b4c22..296cb87827da25dbbb53cd7e302cda2834af5400 100644
--- a/core/modules/package_manager/src/FailureMarker.php
+++ b/core/modules/package_manager/src/FailureMarker.php
@@ -12,7 +12,7 @@
  * code is copied back into it, and then removed afterwards. This allows us to
  * know if a commit operation failed midway through, which could leave the site
  * code base in an indeterminate state -- which, in the worst case scenario,
- * might render Drupal unbootable.
+ * might render Drupal unable to boot.
  */
 final class FailureMarker {
 
diff --git a/core/modules/package_manager/src/ProcessFactory.php b/core/modules/package_manager/src/ProcessFactory.php
index e3cfd03514c523f8174fc3fbf19ff12da3973640..12d73bec27decb82ff72257b2c49941019426e2e 100644
--- a/core/modules/package_manager/src/ProcessFactory.php
+++ b/core/modules/package_manager/src/ProcessFactory.php
@@ -8,6 +8,7 @@
 use PhpTuf\ComposerStager\Infrastructure\Factory\Process\ProcessFactory as StagerProcessFactory;
 use Symfony\Component\Process\Process;
 
+// cspell:ignore BINDIR
 /**
  * Defines a process factory which sets the COMPOSER_HOME environment variable.
  *
diff --git a/core/modules/package_manager/tests/src/Kernel/StageValidationExceptionTest.php b/core/modules/package_manager/tests/src/Kernel/StageValidationExceptionTest.php
index 71e6f89785e06f4e1e6cfc81e59566b5a3e2c734..c3b577ffbf0f52fe738a354e481101f01d851928 100644
--- a/core/modules/package_manager/tests/src/Kernel/StageValidationExceptionTest.php
+++ b/core/modules/package_manager/tests/src/Kernel/StageValidationExceptionTest.php
@@ -28,7 +28,7 @@ class StageValidationExceptionTest extends PackageManagerKernelTestBase {
    *   The test cases.
    */
   public function providerResultsAsText(): array {
-    $messages = ['Blam!', 'Kapow!'];
+    $messages = ['Bang!', 'Pow!'];
     $summary = t('There was sadness.');
 
     $result_no_summary = ValidationResult::createError([$messages[0]]);
diff --git a/core/modules/package_manager/tests/src/Unit/InstalledPackagesDataTest.php b/core/modules/package_manager/tests/src/Unit/InstalledPackagesDataTest.php
index 606d2e2fa7395cb34f1086ba6ece45ceed2dac4d..eb4a859e7b4f9f3cfb3bb9a61dc43dc4c7594d9b 100644
--- a/core/modules/package_manager/tests/src/Unit/InstalledPackagesDataTest.php
+++ b/core/modules/package_manager/tests/src/Unit/InstalledPackagesDataTest.php
@@ -19,7 +19,7 @@ class InstalledPackagesDataTest extends UnitTestCase {
   /**
    * Tests that Composer's `installed.php` file looks how we expect.
    */
-  public function testinstalledPackagesData(): void {
+  public function testInstalledPackagesData(): void {
     $loaders = ClassLoader::getRegisteredLoaders();
     $installed_php = key($loaders) . '/composer/installed.php';
     $this->assertFileIsReadable($installed_php);
diff --git a/core/modules/package_manager/tests/src/Unit/PathLocatorTest.php b/core/modules/package_manager/tests/src/Unit/PathLocatorTest.php
index 540a35900f6aa346aca3cd84f0b1d16331e6e389..0579f4ed396b13eb2a2afab536ab28194663036a 100644
--- a/core/modules/package_manager/tests/src/Unit/PathLocatorTest.php
+++ b/core/modules/package_manager/tests/src/Unit/PathLocatorTest.php
@@ -20,7 +20,7 @@ class PathLocatorTest extends UnitTestCase {
   public function testStagingRoot(): void {
     $config_factory = $this->getConfigFactoryStub([
       'system.site' => [
-        'uuid' => 'my_site_id',
+        'uuid' => '_my_site_id',
       ],
     ]);
     $file_system = $this->prophesize(FileSystemInterface::class);
@@ -31,7 +31,7 @@ public function testStagingRoot(): void {
       $config_factory,
       $file_system->reveal()
     );
-    $this->assertSame('/path/to/temp/.package_managermy_site_id', $path_locator->getStagingRoot());
+    $this->assertSame('/path/to/temp/.package_manager_my_site_id', $path_locator->getStagingRoot());
   }
 
   /**