The term 'move side to side' can be represented by four different words in a crossword puzzle: YAW (3 letters), WAG (3 letters), ROCK (4 letters), and WAGGLE (6 letters). YAW is a nautical term that means to rotate or turn around a vertical axis, while WAG is an informal verb meaning to move from side to side. ROCK is a verb that means to sway or move back and forth, and WAGGLE is a verb that means to move from side to side with quick jerky motions. All of these words describe the same action of moving side to side.