walk-on vs player

walk-on and player both are nouns.

Word	Noun	Adjective	Verb	Adverb
walk-on	Yes	Yes	No	No
player	Yes	No	No	No

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

Other hypernyms of walk-on include actor, histrion, role player, thespian.

walk-on (noun)	player (noun)
plays a small part in a dramatic production	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

walk-on (adjective)	player (adjective)
not capable of or especially not involving speech or spoken lines