In terms of direction:
Opposite of car going forward: car going backward or in reverse.
In terms of function:
Opposite of a car used for transportation: a car used for racing.
In terms of type of vehicle:
Opposite of a car as a passenger vehicle: a car used as a commercial vehicle.
In terms of size:
Opposite of a small car: a large car or truck.
In terms of technology:
Opposite of a modern car: a classic or vintage car.
