showboy vs professional dancer

showboy and professional dancer both are nouns.

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

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

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

showboy (noun)	professional dancer (noun)
a man who dances in a chorus line	a performer who dances professionally