candidate vs worker

candidate and worker both are nouns.

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

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

candidate: someone who is considered for something (for an office or prize or honor etc.)
worker: a person who acts and gets things done

Other hypernyms of candidate include actor, doer.

candidate (noun)	worker (noun)
someone who is considered for something (for an office or prize or honor etc.)	sterile member of a colony of social insects that forages for food and cares for the larvae
a politician who is running for public office	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