stepper vs professional dancer

stepper and professional dancer both are nouns.

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

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

Other hypernyms of stepper include dancer, terpsichorean.

stepper (noun)	professional dancer (noun)
a horse trained to lift its feet high off the ground while walking or trotting	a performer who dances professionally
a motor (especially an electric motor) that moves or rotates in small discrete steps
a professional dancer