muscle builder vs worker

muscle builder and worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
muscle builder	Yes	No	No	No
worker	Yes	No	No	No

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

muscle builder: someone who does special exercises to develop a brawny musculature
worker: a person who acts and gets things done

Other hypernyms of muscle builder include actor, doer.

muscle builder (noun)	worker (noun)
someone who does special exercises to develop a brawny musculature	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