player vs doer

player and doer both are nouns.

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

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

player: a person who pursues a number of different social and sexual partners simultaneously
doer: a person who acts and gets things done

Other hypernyms of player include actor, worker.

player (noun)	doer (noun)
a theatrical performer	a person who acts and gets things done
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