nonparticipant vs doer

nonparticipant and doer both are nouns.

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

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

Other hypernyms of nonparticipant include actor, worker.

nonparticipant (noun)	doer (noun)
a person who does not participate	a person who acts and gets things done