Tennis serve is an important part of the game of tennis. It is the first shot of the point and can be used to set up the rest of the rally. The three solutions for the term tennis serve are ACE (3 letters), LET (3 letters) and FAULT (5 letters). An ACE is a serve that is unreturnable, a LET is a serve that is not counted due to a disturbance, and a FAULT is a serve that does not land in the correct area of the court.