actor vs role player

actor and role player both are nouns.

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

As nouns, actor and role player are synonyms defined as:

Other synonyms of actor include histrion, player, thespian.

actor (noun)	role player (noun)
a theatrical performer	a theatrical performer
a person who acts and gets things done	a person who makes deceitful pretenses