The term "four-by-fours" is commonly used to refer to four-wheel-drive vehicles. However, there are several synonyms that can be used to describe these vehicles. Some popular synonyms include 4WD, off-road vehicles, SUVs, and trucks. 4WD is a more technical term that highlights the four-wheel-drive capability of the vehicle. Off-road vehicles and SUVs, on the other hand, emphasize the ability to navigate rugged terrain. Trucks are also often considered four-by-fours, with many pickup trucks featuring four-wheel-drive capabilities. Whether you prefer to call them 4WDs, off-road vehicles, SUVs, or trucks, these vehicles are known for their ruggedness, versatility, and ability to tackle even the toughest driving conditions.