nark

nouns

an informer or spy working for the police

copper's nark, nark

a lawman concerned with narcotics violations

narc, narcotics agent, nark

cause annoyance in; disturb, especially by minor irritations

"Mosquitoes buzzing in my ear really bothers me"; "It irritates me that she never closes the door after she leaves"

annoy, bother, chafe, devil, get at, get to, gravel, irritate, nark, nettle, rag, rile, vex

inform or spy (for the police)

nark

is a type of (narrower)

impart knowledge of some fact, state or affairs, or event to

"I informed him of his rights"