upstager vs player

upstager and player both are nouns.

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

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

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

upstager (noun)	player (noun)
a selfish actor who upstages the other actors	a theatrical performer
	a person who participates in or is skilled at some game
	someone who plays a music as a profession
	a person who pursues a number of different social and sexual partners simultaneously
	someone who takes part in an activity