Muscle building and Weightlift

Muscle building noun - Exercise that builds muscles through tension.

Weightlift and muscle building are semantically related. In some cases you can replace term "Weightlift" with "Muscle building", this terms are similar.

Weightlift noun - Bodybuilding by exercise that involves lifting weights.

Muscle building and weightlift are semantically related. You can use "Muscle building" instead a noun "Weightlift".