computer user vs doer

computer user and doer both are nouns.

Word	Noun	Adjective	Verb	Adverb
computer user	Yes	No	No	No
doer	Yes	No	No	No

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

computer user: a person who uses computers for work or entertainment or communication or business
doer: a person who acts and gets things done

Other hypernyms of computer user include actor, worker.

computer user (noun)	doer (noun)
a person who uses computers for work or entertainment or communication or business	a person who acts and gets things done