* Reply: This is a general term for a response, so it fits in many situations.
* Respond: Similar to "reply," but implies a more thoughtful or considered response.
* Answer: This is more specific, implying a response to a question.
* Say: A simple and direct way to indicate a verbal response.
* Retort: Used when the response is sharp or witty.
* Reiterate: Implies repeating something said earlier.
The best option will depend on the specific meaning you want to convey.