player vs screen actor

player and screen actor both are nouns.

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

As nouns, screen actor is a hyponym of player; that is, screen actor is a word with a more specific, narrower meaning than player:

player (noun)	screen actor (noun)
a theatrical performer	an actor who plays a role in a film
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