gear

Gear is clothing and other equipment, especially in sports.

Example: Hurry up and get your gear on. The game's about to start.

Gears are wheels that turn and drive other wheels at different speeds.

Example: One of the gears from the motor had got stuck and wouldn't turn.

A gear in a machine, especially a car or bicycle, is a particular combinations of gears.

Example: He put the car into gear and drove off.

A gear is a speed or level that you do something at.

Example: Everyone was working at high gear to finish before the deadline.