jaw vs yack away

jaw is a noun but yack away is not a noun.

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

As verbs, jaw and yack away are synonyms defined as:

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

jaw (noun)	yack away (noun)
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

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