Machine; car (5)
I believe the answer is:
motor
I believe this is a double definition.
'machine' is the first definition.
(motor is a kind of machine)
'car' is the second definition.
(motor can informally mean a car)
(Other definitions for motor that I've seen before include "Wheels" , "Travel by car, engine" , "Car - car's engine" , "go quickly" , "Move fast" .)