amateur vs worker

amateur and worker both are nouns.

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

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

Other hypernyms of amateur include actor, doer.

amateur (noun)	worker (noun)
someone who pursues a study or sport as a pastime	sterile member of a colony of social insects that forages for food and cares for the larvae
an athlete who does not play for pay	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

amateur (adjective)	worker (adjective)
engaged in as a pastime
lacking professional skill or expertise