dancer vs actor

dancer and actor both are nouns.

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

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

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

Other hypernyms of dancer include doer, worker.

dancer (noun)	actor (noun)
a performer who dances professionally	a theatrical performer
a person who participates in a social gathering arranged for dancing (as a ball)	a person who acts and gets things done