General Communication:
* Speak
* Converse
* Chat
* Discuss
* Communicate
* Confer
* Dialogue
* Exchange
* Interact
* Verbalize
* Articulate
* Express
Informal Conversation:
* Gossip
* Shoot the breeze
* Have a chinwag
* Gab
* Yak
* Blab
Formal Conversation:
* Discuss
* Debate
* Negotiate
* Address
* Present
* Advocate
* Argue
Specific Types of Talk:
* Whisper
* Shout
* Mutter
* Grumble
* Rave
* Rattle on
* Brag
* Moan
* Complain
Figurative Language:
* Speak volumes
* Talk a blue streak
* Talk out of turn
* Talk someone into/out of something
The best word to use will depend on the specific situation and the tone you want to convey.