role player vs thespian

role player and thespian both are nouns.

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

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

Other synonyms of role player include actor, histrion, player.

role player (noun)	thespian (noun)
a theatrical performer	a theatrical performer
a person who makes deceitful pretenses

role player (adjective)	thespian (adjective)
	of or relating to drama