playactor vs role player

playactor and role player both are nouns.

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

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

Other hypernyms of playactor include actor, histrion, player, thespian.

playactor (noun)	role player (noun)
an actor who travels around the country presenting plays	a theatrical performer
	a person who makes deceitful pretenses