is a specific kind of: talk about, talk of.

is a broader term that covers: negociate, negotiate, talk terms | negociate | powwow | debate, deliberate | consider, debate, deliberate, moot, turn over | bandy, kick around | chair, lead, moderate | advise, counsel, rede | confab, confabulate, confer, consult | broach, initiate | bandy about | hammer out, thrash out ... show more.

derivation: discussion, give-and-take, word | discussant.