General Synonyms:
* Interjected
* Chimed in
* Said something
* Offered an opinion
* Made a comment
* Contributed
* Participated
* Raised their voice
* Offered input
Synonyms Emphasizing Boldness or Courage:
* Challenged
* Protested
* Defended
* Argued
* Took a stand
Synonyms Emphasizing Assertiveness:
* Declared
* Asserted
* Insisted
* Demanded
Synonyms Emphasizing Support:
* Defended
* Advocated
* Supported
Synonyms Emphasizing a Specific Type of Speech:
* Proclaimed (formal declaration)
* Whispered (quietly)
* Shouted (loudly)
* Debated (discussed)
The best synonym will depend on the specific context and what you want to emphasize.