WordNet sense 1 (a person given to gossiping and divulging personal information about others):

gossiper, rumormonger, gossipmonger, newsmonger, rumourmonger

WordNet sense 2 (a report (often malicious) about the behavior of other people):

scuttlebutt, comment

WordNet sense 3 (light informal conversation for social occasions):

causerie, chitchat, gab, gabfest, tittle-tattle, chin-wag, chin-wagging, small talk

WordNet sense 4 (wag one's tongue; speak about others and reveal secrets or intimacies):

dish the dirt

WordNet sense 5 (talk socially without exchanging too much information):

chat, chatter, confab, confabulate, jaw, natter, visit, chaffer, claver, chew the fat, shoot the breeze