user vs worker

user and worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
user	Yes	No	No	No
worker	Yes	No	No	No

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

user: a person who makes use of a thing; someone who uses or employs something
worker: a person who acts and gets things done

Other hypernyms of user include actor, doer.

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

Other hypernyms of user include actor, doer.

user (noun)	worker (noun)
a person who makes use of a thing; someone who uses or employs something	sterile member of a colony of social insects that forages for food and cares for the larvae
a person who uses something or someone selfishly or unethically	a person who works at a specific occupation
a person who takes drugs	a member of the working class (not necessarily employed)
	a person who acts and gets things done