ballet dancer vs terpsichorean

ballet dancer and terpsichorean both are nouns.

Word	Noun	Adjective	Verb	Adverb
ballet dancer	Yes	No	No	No
terpsichorean	Yes	Yes	No	No

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

Other hypernyms of ballet dancer include dancer, professional dancer.

ballet dancer (noun)	terpsichorean (noun)
a trained dancer who is a member of a ballet company	a performer who dances professionally

ballet dancer (adjective)	terpsichorean (adjective)
	of or relating to dancing