anaerobic exercise vs muscle building

anaerobic exercise and muscle building both are nouns.

Word	Noun	Adjective	Verb	Adverb
anaerobic exercise	Yes	No	No	No
muscle building	Yes	No	No	No

As nouns, anaerobic exercise and muscle building are synonyms defined as:

anaerobic exercise and muscle building: exercise that builds muscles through tension

Other synonyms of anaerobic exercise include bodybuilding, musclebuilding.

anaerobic exercise (noun)	muscle building (noun)
exercise that builds muscles through tension	exercise that builds muscles through tension