nark vs informer

nark and informer both are nouns.

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

As nouns, informer is a hypernym of nark; that is, informer is a word with a broader meaning than nark:

nark: an informer or spy working for the police
informer: one who reveals confidential information to the police or other authority

Other hypernyms of nark include betrayer, blabber, rat, squealer.

nark (noun)	informer (noun)
an informer or spy working for the police	one who reveals confidential information to the police or other authority
a lawman concerned with narcotics violations

nark (verb)	informer (verb)
inform or spy (for the police)
cause annoyance in; disturb, especially by minor irritations