Better and Weightier

Better adjective - (comparative of `good') superior to another (of the same class or set or kind) in excellence or quality or desirability or suitability; more highly skilled than another.

Weightier and better are semantically related. in larger topic. In some cases you can use "Weightier" instead an adjective "Better".

Better and weightier are semantically related. You can use "Better" instead an adjective "Weightier".