scab vs fink

scab and fink both are nouns.

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

As verbs, scab and fink are synonyms defined as:

Other synonyms of scab include blackleg, rat.

scab (noun)	fink (noun)
the crustlike surface of a healing skin lesion	someone acting as an informer or decoy for the police
someone who works (or provides workers) during a strike

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