bodybuilder vs doer

bodybuilder and doer both are nouns.

Word	Noun	Adjective	Verb	Adverb
bodybuilder	Yes	No	No	No
doer	Yes	No	No	No

As nouns, doer is a hypernym of bodybuilder; that is, doer is a word with a broader meaning than bodybuilder:

bodybuilder: someone who does special exercises to develop a brawny musculature
doer: a person who acts and gets things done

Other hypernyms of bodybuilder include actor, worker.

bodybuilder (noun)	doer (noun)
someone who does special exercises to develop a brawny musculature	a person who acts and gets things done