GABBLER
Scrabble letter values: G2A1B3B3L1E1R1 = 12
Definition
GABBLER is the comparative of GABBLE.
verb GABBLE: speak (about unimportant matters) rapidly and incessantly.
Synonyms of GABBLE: chatter, piffle, palaver, prate, tittle-tattle, twaddle, clack, maunder