The crossword solution for the term 'Basketball Filler' is AIR, which is a three-letter word. Basketball is a popular sport that involves two teams of five players each trying to score points by shooting a ball through a hoop. The ball is filled with AIR, which gives it its bounce and makes it easier to handle. AIR is an essential part of basketball, as it allows the ball to move freely and quickly. Without AIR, the ball would be too heavy and difficult to control.