chatter vs yak

chatter and yak both are nouns.

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

As nouns, chatter and yak are synonyms defined as:

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

chatter (noun)	yak (noun)
noisy talk	large long-haired wild ox of Tibet often domesticated
the high-pitched continuing noise made by animals (birds or monkeys)	noisy talk
the rapid series of noises made by the parts of a machine

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