get at vs nark

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

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

As verbs, get at and nark are synonyms defined as:

get at and nark: cause annoyance in; disturb, especially by minor irritations

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

get at (noun)	nark (noun)
	an informer or spy working for the police
	a lawman concerned with narcotics violations

get at (verb)	nark (verb)
cause annoyance in; disturb, especially by minor irritations	inform or spy (for the police)
reach or gain access to	cause annoyance in; disturb, especially by minor irritations
influence by corruption