bodybuilder vs muscle-builder

bodybuilder and muscle-builder both are nouns.

Word	Noun	Adjective	Verb	Adverb
bodybuilder	Yes	No	No	No
muscle-builder	Yes	No	No	No

As nouns, bodybuilder and muscle-builder are synonyms defined as:

bodybuilder and muscle-builder: someone who does special exercises to develop a brawny musculature

Other synonyms of bodybuilder include muscle builder, musclebuilder, muscleman.

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