A word list holds names and terms callers say that a recognizer would otherwise mishear, such as product, drug or street names. POST /api/v1/voice/vocabularies with { "name": "Products", "terms": ["Lumora", "Vantix Pro"] } (up to 1,000 terms of 50 characters, or "preset": "medical" or "legal" to start from), then set the agent's vocabulary_id. GET, PATCH (name, terms) and DELETE /vocabularies/{id}; a list an agent uses cannot be deleted.