agreeable rattle
babbler
big talker
blab
blabber
blabberer
blabbermouth
blatherer
chatterbox
chatterer
gabber
gabbler
gasbag
gibble-gabbler
great talker
hot-air artist
idle chatterer
jay
magpie
moulin a paroles
patterer
prater
prattler
rattle
windbag
windjammer
word-slinger
speaker
talker
utterer
verbaliser
verbalizer