yack vs jaw

yack and jaw both are nouns.

Word	Noun	Adjective	Verb	Adverb
yack	Yes	No	Yes	No
jaw	Yes	No	Yes	No

As verbs, yack and jaw are synonyms defined as:

Other synonyms of yack include rattle on, yack away, yap away.

yack (noun)	jaw (noun)
noisy talk	holding device consisting of one or both of the opposing parts of a tool that close to hold an object
	the part of the skull of a vertebrate that frames the mouth and holds the teeth
	the bones of the skull that frame the mouth and serve to open it; the bones that hold the teeth

yack (verb)	jaw (verb)
talk incessantly and tiresomely	talk socially without exchanging too much information
	censure severely or angrily
	talk incessantly and tiresomely
	chew (food); to bite and grind with the teeth