scab vs worker

scab and worker both are nouns.

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

As nouns, worker is a hypernym of scab; that is, worker is a word with a broader meaning than scab:

scab (noun)	worker (noun)
the crustlike surface of a healing skin lesion	sterile member of a colony of social insects that forages for food and cares for the larvae
someone who works (or provides workers) during a strike	a person who works at a specific occupation
	a member of the working class (not necessarily employed)
	a person who acts and gets things done

scab (verb)	worker (verb)
form a scab
take the place of work of someone on strike