Better and Getting well

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.

Getting well and better are semantically related In some cases you can use "Getting well" instead an adjective "Better".

Better and getting well are semantically related in correct topic. Sometimes you can use "Better" instead the phrase "Getting well" as a verb or an adjective, if it concerns topics such as improve in health.