Twin vs worker

Twin and worker both are nouns.

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

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

Other hypernyms of Twin include actor, doer.

Twin (noun)	worker (noun)
a waterfall in the Snake River in southern Idaho	sterile member of a colony of social insects that forages for food and cares for the larvae
(astrology) a person who is born while the sun is in Gemini	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