General:
* Discussion: This is the most common and straightforward option.
* Conversation: More informal than "discussion," this implies a more casual exchange of ideas.
* Dialogue: Focuses on the back-and-forth nature of communication.
* Debate: Implies a more formal and structured exchange of arguments.
* Talk: A broad term that can encompass any type of spoken communication.
More specific:
* Conference: A formal meeting where people discuss a specific topic.
* Negotiation: A process of discussion aimed at reaching an agreement.
* Symposium: A gathering of experts to discuss a topic.
* Forum: A public space where people can discuss various topics.
* Exchange: Emphasis on the reciprocal nature of the communication.
* Brainstorming: A creative discussion process used to generate ideas.
The best noun to use will depend on the specific situation and the tone you want to convey.