bodybuilding vs musclebuilding

bodybuilding and musclebuilding both are nouns.

Word	Noun	Adjective	Verb	Adverb
bodybuilding	Yes	No	No	No
musclebuilding	Yes	No	No	No

As nouns, bodybuilding and musclebuilding are synonyms defined as:

bodybuilding and musclebuilding: exercise that builds muscles through tension

Other synonyms of bodybuilding include anaerobic exercise, muscle building.

bodybuilding (noun)	musclebuilding (noun)
exercise that builds muscles through tension	exercise that builds muscles through tension