dancer vs worker

dancer and worker both are nouns.

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

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

dancer: a person who participates in a social gathering arranged for dancing (as a ball)
worker: a person who acts and gets things done

Other hypernyms of dancer include actor, doer.

dancer (noun)	worker (noun)
a performer who dances professionally	sterile member of a colony of social insects that forages for food and cares for the larvae
a person who participates in a social gathering arranged for dancing (as a ball)	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