upstager vs role player

upstager and role player both are nouns.

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

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

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

upstager (noun)	role player (noun)
a selfish actor who upstages the other actors	a theatrical performer
	a person who makes deceitful pretenses