General:
* Spoken
* Verbal
* Vocal
* Spoken
* Verbalized
Specifically related to communication:
* Articulated
* Expressed
* Utterance
* Conversation
* Dialogue
Specifically related to the mouth:
* Mouth
* Buccal (medical term)
* Lingual (relating to the tongue)
Other:
* Verbalized
* Vocalized
The best synonym will depend on the specific context in which you are using the word "oral."