muscle-builder vs musclebuilder

muscle-builder and musclebuilder both are nouns.

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

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

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

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

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