The crossword solution for the term 'A Baseball, But Not A Football' is 'SPHERE'. A SPHERE is a three-dimensional shape that is round and symmetrical. It is the most basic of all shapes and is often used to represent a ball. In this case, it is being used to represent a baseball, which is a round object that is used in the sport of baseball. However, it is not being used to represent a football, which is an oval-shaped object used in the sport of football.