When referring to a four-wheel drive vehicle, there are a few different terms that can be used interchangeably. One of these is an off-road vehicle, which suggests that the vehicle is designed for driving in rough or unpaved terrain. Another synonym is an all-wheel drive vehicle, which means that power is directed to all four wheels of the vehicle. A 4x4 vehicle is another commonly used term, which refers to a vehicle that has four-wheel drive capabilities and is often used for off-roading or other adventurous activities. Finally, a SUV (sport utility vehicle) is also often used to describe a four-wheel drive vehicle, as it is a versatile and rugged vehicle that can handle a variety of different terrains and driving conditions.