diff --git a/.gitattributes b/.gitattributes
index 6d14a19..917ca6f 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,3 +1,7 @@
 # Shell scripts must keep LF line endings, also on Windows checkouts with
 # core.autocrlf, or bash fails on the carriage returns.
 *.sh text eol=lf
+
+# The Whisper word list is generated (npm run export:voice-vocabulary) and
+# copied into the image; keep LF so the file stays byte-identical everywhere.
+ApiCore-Whisper/vocabulary.txt text eol=lf
diff --git a/ApiCore-Backend/package.json b/ApiCore-Backend/package.json
index 3bbf95e..bccab2d 100644
--- a/ApiCore-Backend/package.json
+++ b/ApiCore-Backend/package.json
@@ -22,7 +22,8 @@
     "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
     "test:e2e": "jest --config ./test/jest-e2e.json",
     "migrate:deploy": "prisma migrate deploy",
-    "seed": "node dist/seed.js"
+    "seed": "node dist/seed.js",
+    "export:voice-vocabulary": "ts-node scripts/export-voice-vocabulary.ts"
   },
   "dependencies": {
     "@nestjs/common": "^11.0.1",
diff --git a/ApiCore-Backend/scripts/export-voice-vocabulary.ts b/ApiCore-Backend/scripts/export-voice-vocabulary.ts
new file mode 100644
index 0000000..abb3074
--- /dev/null
+++ b/ApiCore-Backend/scripts/export-voice-vocabulary.ts
@@ -0,0 +1,15 @@
+/**
+ * Writes the Whisper initial prompt to ApiCore-Whisper/vocabulary.txt, so the
+ * Python image uses the same word list as the backend (one source:
+ * src/voice/core/voice-vocabulary.ts). Run `npm run export:voice-vocabulary`
+ * after changing the list; voice-vocabulary-export.spec.ts fails until you do.
+ */
+import { mkdirSync, writeFileSync } from 'node:fs';
+import { dirname, join } from 'node:path';
+import { whisperInitialPrompt } from '../src/voice/core/voice-vocabulary';
+
+const target = join(__dirname, '..', '..', 'ApiCore-Whisper', 'vocabulary.txt');
+
+mkdirSync(dirname(target), { recursive: true });
+writeFileSync(target, `${whisperInitialPrompt()}\n`, 'utf8');
+console.log(`Wrote ${target}`);
diff --git a/ApiCore-Backend/src/voice/core/voice-vocabulary-export.spec.ts b/ApiCore-Backend/src/voice/core/voice-vocabulary-export.spec.ts
new file mode 100644
index 0000000..fe0020d
--- /dev/null
+++ b/ApiCore-Backend/src/voice/core/voice-vocabulary-export.spec.ts
@@ -0,0 +1,26 @@
+import { existsSync, readFileSync } from 'node:fs';
+import { join } from 'node:path';
+import { whisperInitialPrompt } from './voice-vocabulary';
+
+const MONOREPO_ROOT = join(__dirname, '..', '..', '..', '..');
+const VOCABULARY_FILE = join(
+  MONOREPO_ROOT,
+  'ApiCore-Whisper',
+  'vocabulary.txt',
+);
+
+// The backend image build only sees ApiCore-Backend, so the comparison runs in
+// the monorepo checkout and is skipped inside that build.
+const inMonorepo = existsSync(join(MONOREPO_ROOT, 'ApiCore-Frontend'));
+const describeInMonorepo = inMonorepo ? describe : describe.skip;
+
+describeInMonorepo('whisper vocabulary export', () => {
+  it('the whisper vocabulary file equals whisperInitialPrompt()', () => {
+    // Windows checkouts may turn LF into CRLF; the content is what counts.
+    const onDisk = readFileSync(VOCABULARY_FILE, 'utf8')
+      .replace(/\r\n/g, '\n')
+      .replace(/\n$/, '');
+
+    expect(onDisk).toBe(whisperInitialPrompt());
+  });
+});
diff --git a/ApiCore-Backend/tsconfig.build.json b/ApiCore-Backend/tsconfig.build.json
index 6b878ed..47bc3c3 100644
--- a/ApiCore-Backend/tsconfig.build.json
+++ b/ApiCore-Backend/tsconfig.build.json
@@ -6,5 +6,5 @@
     // outside it would make the next build skip "unchanged" files.
     "incremental": false
   },
-  "exclude": ["node_modules", "test", "dist", "**/*spec.ts", "**/*.spec-helper.ts", "prisma.config.ts", "prisma/seed.ts"]
+  "exclude": ["node_modules", "test", "scripts", "dist", "**/*spec.ts", "**/*.spec-helper.ts", "prisma.config.ts", "prisma/seed.ts"]
 }
diff --git a/ApiCore-Whisper/vocabulary.txt b/ApiCore-Whisper/vocabulary.txt
new file mode 100644
index 0000000..38df70e
--- /dev/null
+++ b/ApiCore-Whisper/vocabulary.txt
@@ -0,0 +1 @@
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