Formal:
* Declared: Used for a formal or authoritative statement.
* Announced: Used for a public statement.
* Stated: Used for a clear and precise statement.
* Expressed: Used for a statement of feelings or opinions.
* Affirmed: Used for a statement of confirmation or agreement.
* Averred: Used for a statement made with strong conviction.
Informal:
* Spoke: A general term for uttering words.
* Remarked: Used for a casual comment or observation.
* Replied: Used for a response to a question or statement.
* Added: Used for a statement that supplements a previous one.
* Noted: Used for a statement made in passing or as a reminder.
* Whispered: Used for a statement spoken softly and privately.
* Muttered: Used for a statement spoken in a low, unclear voice.
Figurative:
* Proclaimed: Used for a bold or dramatic statement.
* Cried: Used for a statement made with strong emotion.
* Breathed: Used for a statement spoken softly or with hesitation.
* Hinted: Used for an indirect or subtle statement.
The best word to use will depend on the specific situation and the tone you want to set.