chew up vs jaw

chew up is not a noun while jaw is a noun.

Word	Noun	Adjective	Verb	Adverb
chew up	No	No	Yes	No
jaw	Yes	No	Yes	No

As verbs, chew up and jaw are synonyms defined as:

chew up (noun)	jaw (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

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