role player vs performer

role player and performer both are nouns.

Word	Noun	Adjective	Verb	Adverb
role player	Yes	No	No	No
performer	Yes	No	No	No

As nouns, performer is a hypernym of role player; that is, performer is a word with a broader meaning than role player:

role player: a theatrical performer
performer: an entertainer who performs a dramatic or musical work for an audience

Other hypernyms of role player include performing artist.

role player (noun)	performer (noun)
a theatrical performer	an entertainer who performs a dramatic or musical work for an audience
a person who makes deceitful pretenses