What is the term used for someone who has property or interest in a vehicle?

The term used for someone who has property or interest in a vehicle is "Owner." This designation refers to a person or entity that holds legal rights to a vehicle, including the ability to control and transfer ownership of the vehicle. The owner is typically the individual whose name is listed on the vehicle's title and registration documents.

In contrast, other terms have specific meanings that do not imply ownership. For instance, a "Driver" usually refers to someone who operates a vehicle, possibly without having any ownership stake. The term "User" can suggest a person who uses the vehicle but does not own it. "Operator" generally identifies anyone who is in control of the vehicle while it is in motion, which again does not necessarily imply that they have ownership. Therefore, "Owner" is the most accurate term for someone with property or interest in a vehicle.