exotic belly dancer vs dancer

exotic belly dancer and dancer both are nouns.

Word	Noun	Adjective	Verb	Adverb
exotic belly dancer	Yes	No	No	No
dancer	Yes	No	No	No

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

Other hypernyms of exotic belly dancer include professional dancer, terpsichorean.

exotic belly dancer (noun)	dancer (noun)
a woman who performs a solo belly dance	a performer who dances professionally
	a person who participates in a social gathering arranged for dancing (as a ball)