Utter is a verb that means to speak, articulate or express something audibly or vocally. There are several synonyms that can be used in place of this word. For instance, you can use words like voice, articulate, enunciate, pronounce, declare, announce, state, express, convey, or divulge among others.
When one uses voice, it means to express an opinion or idea in words or sound. Articulate means to speak clearly and coherently to be understood by the listener, while enunciate means to utter words or sentences precisely and clearly. Uttering something means to say it firmly and loudly, to declare something publicly.
In summary, there are many synonyms for the word "utter," and they all have a similar meaning, which is to express something loudly or orally in an audible manner.