Learn That Word

Synonyms for Blabber (same or very similar meaning)

WordNet sense 1 (one who reveals confidential information in return for money):
betrayer, informer, rat, squealer

WordNet sense 2 (speak (about unimportant matters) rapidly and incessantly):
blab, chatter, clack, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle


From the ODE community, based on WordNetadd/edit