gab

[1]	jabber , gabble , chatter , gibber , blather/blether , prate , prattle , blab , gossip , (Colloq) (Brit) natter , witter , (Slang) jaw , yack , (US) run off at the mouth
[2]	yak

[1]

chitchat , chit-chat , chit chat , small talk , gabfest , gossip , tittle-tattle , chin wag , chin-wag , chin wagging , chin-wagging , causerie

[2]

chatter , chit-chat , prattle , jibber-jabber , jabber , gossip , blarney , blather/blether , tittle-tattle , cackle , moonshine , nonsense , drivel , twaddle , rubbish , gobbledegook/gobbledygook , mumbo-jumbo , poppycock , bunk/bunkum , balderdash , stuff and nonsense , hogwash , eyewash , (Colloq) piffle , flummery , rot , bull , codswallop , (Slang) bullshit , horseshit , shit , crap , garbage , (Mainly Brit) tosh , balls