Synonyms for Prate (same or very similar meaning)
WordNet sense 1 (idle or foolish and irrelevant talk):
prattle, blether, chin music, idle talkWordNet sense 2 (speak (about unimportant matters) rapidly and incessantly):
blab, blabber, chatter, clack, gabble, gibber, maunder, palaver, piffle, tattle, tittle-tattle, twaddleFrom the ODE community, based on WordNetadd/edit