yakety-yak vs chatter

yakety-yak and chatter both are nouns.

Word	Noun	Adjective	Verb	Adverb
yakety-yak	Yes	No	No	No
chatter	Yes	No	Yes	No

As nouns, yakety-yak and chatter are synonyms defined as:

Other synonyms of yakety-yak include cackle, yack, yak.

yakety-yak (noun)	chatter (noun)
noisy talk	noisy talk
	the high-pitched continuing noise made by animals (birds or monkeys)
	the rapid series of noises made by the parts of a machine

yakety-yak (verb)	chatter (verb)
	speak (about unimportant matters) rapidly and incessantly
	talk socially without exchanging too much information
	make noise as if chattering away
	cut unevenly with a chattering tool
	click repeatedly or uncontrollably