Same word as yapper:
babblemouth, babbler, bag of wind, bigmouth, blabber, blabberer, blowhard, chatterbox, chatterer, gabber, gasbag, gossiper, gossipmonger, jabberer, loudmouth, motor-mouth, squealer, tattletale, windbag, yapper
babblemouth, babbler, bag of wind, bigmouth, blabber, blabberer, blowhard, chatterbox, chatterer, gabber, gasbag, gossiper, gossipmonger, jabberer, loudmouth, motor-mouth, squealer, tattletale, windbag, yapper