Better and Knife-edged

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.

Knife-edged and better are semantically related. In some cases you can use "Knife-edged" instead an adjective "Better".

Better and knife-edged are semantically related. Sometimes you can use "Better" instead an adjective phrase "Knife-edged".