grate vs nark

grate and nark both are nouns.

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

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

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

grate (noun)	nark (noun)
a frame of iron bars to hold a fire	an informer or spy working for the police
a barrier that has parallel or crossed bars blocking a passage but admitting air	a lawman concerned with narcotics violations
a harsh rasping sound made by scraping something

grate (verb)	nark (verb)
make a grating or grinding sound by rubbing together	inform or spy (for the police)
scratch repeatedly	cause annoyance in; disturb, especially by minor irritations
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