The term 'turn on an axis' can be broken down into four crossword solutions: REVOLVE (7 letters), SLUE (4 letters), PIVOT (5 letters), and ROTATE (6 letters). All of these words refer to the same action, which is to ROTATE or spin around a fixed point. REVOLVE and ROTATE are the most commonly used terms for this action, while SLUE and PIVOT are more specific terms that refer to a particular type of rotation. Slueing is a type of rotation in which the object moves in an arc, while pivoting is a type of rotation in which the object stays in the same plane.