谈: talk,chat,speak,discuss,conversation
谈论:talk about
我们正在谈论这件事 We are talking about it.
谈话:conversation ,talk ,chat
他和老师在谈话 He and the teacher are talking.
我能听到他们的谈话I can hear their conversation.
谈判:negotiations
闲谈:chat
我经常和马特长时间地闲谈。I often had a long chat with Matt.