grate vs get at

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

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

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

Other hypernyms of grate include annoy, bother, chafe, devil, get to, gravel, irritate, nark, nettle, rag, rile, vex.

grate (noun)	get at (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

grate (verb)	get at (verb)
make a grating or grinding sound by rubbing together	cause annoyance in; disturb, especially by minor irritations
scratch repeatedly	reach or gain access to
reduce to small shreds or pulverize by rubbing against a rough or sharp perforated surface	influence by corruption
gnaw into; make resentful or angry
furnish with a grate