blabber vs fink

blabber and fink both are nouns.

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

As nouns, fink is a hyponym of blabber; that is, fink is a word with a more specific, narrower meaning than blabber:

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

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

blabber (verb)	fink (verb)
speak (about unimportant matters) rapidly and incessantly	confess to a punishable or reprehensible deed, usually under pressure
	take the place of work of someone on strike