showboy vs dancer

showboy and dancer both are nouns.

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

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

Other hypernyms of showboy include professional dancer, terpsichorean, adult male, man.

showboy (noun)	dancer (noun)
a man who dances in a chorus line	a performer who dances professionally
	a person who participates in a social gathering arranged for dancing (as a ball)