learner vs worker

learner and worker both are nouns.

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

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

learner: someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs
worker: a person who acts and gets things done

Other hypernyms of learner include actor, doer.

learner (noun)	worker (noun)
someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs	sterile member of a colony of social insects that forages for food and cares for the larvae
works for an expert to learn a trade	a person who works at a specific occupation
	a member of the working class (not necessarily employed)
	a person who acts and gets things done