jaw vs chew up

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

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

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

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