General:
* Speaker - The most common and neutral term.
* Talker - Similar to speaker, but can sometimes carry a slightly informal or even negative connotation (e.g., "He's a real talker!").
* Orator - A more formal term, usually referring to someone who is skilled in public speaking.
* Communicator - Emphasizes the act of conveying information or ideas.
Specific contexts:
* Lecturer - Someone who gives a formal speech or presentation.
* Narrator - Someone who tells a story.
* Advocate - Someone who speaks in support of a cause or person.
* Witness - Someone who gives testimony in court.
* Interpreter - Someone who translates languages.
Other options:
* Articulator - Someone who speaks clearly and precisely.
* Verbalizer - Someone who expresses themselves through words.
* Elocutioner - Someone who is skilled in the art of public speaking and pronunciation.
The best word to use will depend on the specific context and the meaning you want to convey.