muscle building vs anaerobic exercise

muscle building and anaerobic exercise both are nouns.

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

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

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

Other synonyms of muscle building include bodybuilding, musclebuilding.

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