diff --git a/core/lib/Drupal/Core/File/MimeType/ExtensionMimeTypeGuesser.php b/core/lib/Drupal/Core/File/MimeType/ExtensionMimeTypeGuesser.php
index ac2746bcf6b1..56467361b564 100644
--- a/core/lib/Drupal/Core/File/MimeType/ExtensionMimeTypeGuesser.php
+++ b/core/lib/Drupal/Core/File/MimeType/ExtensionMimeTypeGuesser.php
@@ -17,6 +17,7 @@ class ExtensionMimeTypeGuesser implements MimeTypeGuesserInterface {
    *   Array of mimetypes correlated to the extensions that relate to them.
    */
   protected $defaultMapping = [
+    // cspell:disable
     'mimetypes' => [
       0 => 'application/andrew-inset',
       1 => 'application/atom',
@@ -867,6 +868,7 @@ class ExtensionMimeTypeGuesser implements MimeTypeGuesserInterface {
       'json' => 361,
       'avif' => 362,
     ],
+    // cspell:enable
   ];
 
   /**
diff --git a/core/lib/Drupal/Core/Mail/MailFormatHelper.php b/core/lib/Drupal/Core/Mail/MailFormatHelper.php
index 87726dec3d86..c3fc206721f9 100644
--- a/core/lib/Drupal/Core/Mail/MailFormatHelper.php
+++ b/core/lib/Drupal/Core/Mail/MailFormatHelper.php
@@ -6,6 +6,8 @@ use Drupal\Component\Utility\Html;
 use Drupal\Component\Utility\Xss;
 use Drupal\Core\Site\Settings;
 
+// cspell:ignore officedocument openxmlformats wordprocessingml
+
 /**
  * Defines a class containing utility methods for formatting mail messages.
  */
diff --git a/core/misc/cspell/dictionary.txt b/core/misc/cspell/dictionary.txt
index 57152733ee03..f367186c6144 100644
--- a/core/misc/cspell/dictionary.txt
+++ b/core/misc/cspell/dictionary.txt
@@ -11,7 +11,6 @@ allwords
 alphadecimal
 ampm
 anyall
-applix
 archiver
 archivers
 arrowrefresh
@@ -152,7 +151,6 @@ contextuals
 controlgroup
 conv
 corge
-cpio
 createrole
 createuser
 crema
@@ -292,7 +290,6 @@ funic
 gabilondo
 gids
 gloop
-gnumeric
 googleapis
 greeking
 gripsmall
@@ -349,9 +346,6 @@ keypresses
 keyvalue
 kinberg
 kolkata
-kpresenter
-kspread
-kword
 lamoids
 languageswitcher
 libc
@@ -383,13 +377,10 @@ lrdd
 lstitle
 ltitle
 lzma
-lzop
-macbinary
 mainpage
 mank
 maryjane
 matchout
-mathematica
 maximumred
 maxlifetime
 maynot
@@ -423,7 +414,6 @@ montag
 msgctxt
 msgid
 msgstr
-msword
 mucho
 mulrev
 mulrevpub
@@ -478,14 +468,11 @@ nyan
 nyancat
 nyans
 oembed
-officedocument
 omittable
 onecol
 oneplusfourgrid
 onetwo
 onewidgetfield
-opendocument
-openxmlformats
 optgroups
 optin
 orgchart
@@ -550,7 +537,6 @@ preprocessors
 prerender
 prerendered
 presave
-presentationml
 pretransaction
 preuninstall
 processlist
@@ -653,13 +639,11 @@ specialchars
 spiffiness
 splitbutton
 splitbuttons
-spreadsheetml
 squaresmall
 squiz
 squizlabs
 srcset
 ssess
-stardivision
 starterkit
 statuscode
 stdclass
@@ -672,7 +656,6 @@ strikethrough
 striptags
 strs
 sttid
-stuffit
 styleguide
 stylelint
 stylescombo
@@ -727,7 +710,6 @@ tablesorts
 tabset
 tabwidth
 tappable
-tarz
 taskless
 tcomment
 templating
@@ -842,8 +824,6 @@ webmozart
 webroot
 webservers
 widthx
-wmlscript
-wordprocessingml
 wordsafe
 writeln
 wwwrun
diff --git a/core/modules/file/src/IconMimeTypes.php b/core/modules/file/src/IconMimeTypes.php
index 982f8f45ac21..f1989aeab63c 100644
--- a/core/modules/file/src/IconMimeTypes.php
+++ b/core/modules/file/src/IconMimeTypes.php
@@ -4,8 +4,6 @@ declare(strict_types=1);
 
 namespace Drupal\file;
 
-// cspell:ignore abiword
-
 /**
  * A utility class for working with MIME types.
  */
@@ -48,6 +46,7 @@ final class IconMimeTypes {
    *   The generic icon MIME package expected for this file.
    */
   public static function getGenericMimeType(string $mimeType): string | false {
+    // cspell:disable
     switch ($mimeType) {
       // Word document types.
       case 'application/msword':
@@ -171,6 +170,7 @@ final class IconMimeTypes {
       default:
         return FALSE;
     }
+    // cspell:enable
   }
 
 }
diff --git a/core/modules/file/tests/src/Kernel/LegacyFileModuleTest.php b/core/modules/file/tests/src/Kernel/LegacyFileModuleTest.php
index e3ff66a2bc5b..1239a570c801 100644
--- a/core/modules/file/tests/src/Kernel/LegacyFileModuleTest.php
+++ b/core/modules/file/tests/src/Kernel/LegacyFileModuleTest.php
@@ -6,6 +6,8 @@ namespace Drupal\Tests\file\Kernel;
 
 use Drupal\KernelTests\KernelTestBase;
 
+// cspell:ignore msword
+
 /**
  * Tests file module deprecations.
  *
diff --git a/core/modules/jsonapi/tests/src/Functional/FileUploadTest.php b/core/modules/jsonapi/tests/src/Functional/FileUploadTest.php
index 77a53c0c2ec0..bc566701d7af 100644
--- a/core/modules/jsonapi/tests/src/Functional/FileUploadTest.php
+++ b/core/modules/jsonapi/tests/src/Functional/FileUploadTest.php
@@ -18,7 +18,7 @@ use Drupal\user\Entity\User;
 use GuzzleHttp\RequestOptions;
 use Psr\Http\Message\ResponseInterface;
 
-// cspell:ignore èxample
+// cspell:ignore èxample msword
 
 /**
  * Tests binary data file upload route.
diff --git a/core/modules/rest/tests/src/Functional/FileUploadResourceTestBase.php b/core/modules/rest/tests/src/Functional/FileUploadResourceTestBase.php
index 5dba42b4d086..36aa1b00b973 100644
--- a/core/modules/rest/tests/src/Functional/FileUploadResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/FileUploadResourceTestBase.php
@@ -18,7 +18,7 @@ use Drupal\user\Entity\User;
 use GuzzleHttp\RequestOptions;
 use Psr\Http\Message\ResponseInterface;
 
-// cspell:ignore èxample
+// cspell:ignore èxample msword
 
 /**
  * Tests binary data file upload route.
diff --git a/core/modules/system/tests/src/Functional/DrupalKernel/ContentNegotiationTest.php b/core/modules/system/tests/src/Functional/DrupalKernel/ContentNegotiationTest.php
index 8212a02623e3..84db05197d81 100644
--- a/core/modules/system/tests/src/Functional/DrupalKernel/ContentNegotiationTest.php
+++ b/core/modules/system/tests/src/Functional/DrupalKernel/ContentNegotiationTest.php
@@ -6,6 +6,8 @@ namespace Drupal\Tests\system\Functional\DrupalKernel;
 
 use Drupal\Tests\BrowserTestBase;
 
+// cspell:ignore msword
+
 /**
  * Tests content negotiation.
  *
diff --git a/core/tests/Drupal/Tests/Core/Mail/MailFormatHelperTest.php b/core/tests/Drupal/Tests/Core/Mail/MailFormatHelperTest.php
index 52b4bbd0f6e8..f0cac252767c 100644
--- a/core/tests/Drupal/Tests/Core/Mail/MailFormatHelperTest.php
+++ b/core/tests/Drupal/Tests/Core/Mail/MailFormatHelperTest.php
@@ -7,6 +7,8 @@ namespace Drupal\Tests\Core\Mail;
 use Drupal\Core\Mail\MailFormatHelper;
 use Drupal\Tests\UnitTestCase;
 
+// cspell:ignore officedocument openxmlformats wordprocessingml
+
 /**
  * @coversDefaultClass \Drupal\Core\Mail\MailFormatHelper
  * @group Mail