ethnic vs worker

ethnic and worker both are nouns.

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

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

Other hypernyms of ethnic include actor, doer.

ethnic (noun)	worker (noun)
a person who is a member of an ethnic group	sterile member of a colony of social insects that forages for food and cares for the larvae
	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

ethnic (adjective)	worker (adjective)
not acknowledging the God of Christianity and Judaism and Islam
denoting or deriving from or distinctive of the ways of living built up by a group of people