masticate vs grate

masticate is not a noun while grate is a noun.

Word	Noun	Adjective	Verb	Adverb
masticate	No	No	Yes	No
grate	Yes	No	Yes	No

As verbs, grate is a hypernym of masticate; that is, grate is a word with a broader meaning than masticate:

Other hypernyms of masticate include grind.

masticate (noun)	grate (noun)
	a frame of iron bars to hold a fire
	a barrier that has parallel or crossed bars blocking a passage but admitting air
	a harsh rasping sound made by scraping something

masticate (verb)	grate (verb)
chew (food); to bite and grind with the teeth	make a grating or grinding sound by rubbing together
grind and knead	scratch repeatedly
	reduce to small shreds or pulverize by rubbing against a rough or sharp perforated surface
	gnaw into; make resentful or angry
	furnish with a grate