fink vs betrayer

fink and betrayer both are nouns.

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

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

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

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

fink (noun)	betrayer (noun)
someone acting as an informer or decoy for the police	a person who says one thing and does another
	one who reveals confidential information to the police or other authority

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