fink vs informer

fink and informer both are nouns.

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

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

fink: someone acting as an informer or decoy for the police
informer: one who reveals confidential information to the police or other authority

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

fink (noun)	informer (noun)
someone acting as an informer or decoy for the police	one who reveals confidential information to the police or other authority

fink (verb)	informer (verb)
confess to a punishable or reprehensible deed, usually under pressure
take the place of work of someone on strike