upstager vs actor

upstager and actor both are nouns.

Word	Noun	Adjective	Verb	Adverb
upstager	Yes	No	No	No
actor	Yes	No	No	No

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

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

upstager (noun)	actor (noun)
a selfish actor who upstages the other actors	a theatrical performer
	a person who acts and gets things done