driver
noun
[ ˈdrʌɪvə ]
• a person who drives a vehicle.
• "a taxi driver"
• a wheel or other part in a mechanism that receives power directly and transmits motion to other parts.
• a factor which causes a particular phenomenon to happen or develop.
• "the hope of achieving such monopolies becomes the main driver of investment"
• a golf club with a flat face and wooden head, used for driving from the tee.
