The crossword solution for the term VOLLEYBALL FILLER is AIR. This term is used to describe the action of a player hitting the ball in a volleyball game. The player must hit the ball with enough force and accuracy to send it over the net and into the opposing team's court. The player must also ensure that the ball does not touch the ground before it reaches the other side. AIR is an important part of the game as it allows players to control the speed and direction of the ball.