| Interface | Description | 
|---|---|
| AddWordOptions.PartOfSpeech | **Japanese only.** The part of speech for the word. | 
| CreateVoiceModelOptions.Language | The language of the new custom voice model. | 
| CustomWord.PartOfSpeech | **Japanese only.** The part of speech for the word. | 
| GetPronunciationOptions.Format | The phoneme format in which to return the pronunciation. | 
| GetPronunciationOptions.Voice | A voice that specifies the language in which the pronunciation is to be returned. | 
| GetVoiceOptions.Voice | The voice for which information is to be returned. | 
| ListVoiceModelsOptions.Language | The language for which custom voice models that are owned by the requesting service credentials are to be returned. | 
| SynthesizeOptions.Accept | The type of the response: audio/basic, audio/flac, audio/l16;rate=nnnn, audio/ogg, audio/ogg;codecs=opus,
 audio/ogg;codecs=vorbis, audio/mp3, audio/mpeg, audio/mulaw;rate=nnnn, audio/wav, audio/webm,
 audio/webm;codecs=opus, or audio/webm;codecs=vorbis. | 
| SynthesizeOptions.Voice | The voice to use for synthesis. | 
| Translation.PartOfSpeech | **Japanese only.** The part of speech for the word. | 
| Word.PartOfSpeech | **Japanese only.** The part of speech for the word. |