get at vs grate

get at is not a noun while grate is a noun.

Word	Noun	Adjective	Verb	Adverb
get at	No	No	Yes	No
grate	Yes	No	Yes	No

As verbs, grate is a hyponym of get at; that is, grate is a word with a more specific, narrower meaning than get at:

get at (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

get at (verb)	grate (verb)
cause annoyance in; disturb, especially by minor irritations	make a grating or grinding sound by rubbing together
reach or gain access to	scratch repeatedly
influence by corruption	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