How about accepting just "return", and just "tweener" (also "hot dog" for some). And "approach shot" isn't really a shot, as it can be played with a slice, a drop shot, a backhand, a forehand... It really only says something about the movement of the player.
On the other hand, since you have slice, you should definitely include "topspin" and "drive" as well.
On the other hand, since you have slice, you should definitely include "topspin" and "drive" as well.