A self-propelled passenger vehicle that usually has four wheels and an internal-combustion engine, used for land transport.
The definition of an automobile is a means of transportation that usually has wheels and an engine.
A car is an example of an automobile.
A passenger vehicle, usually four-wheeled, propelled by an engine or motor that is part of it, esp. an internal-combustion engine, and meant for traveling on streets or roads; motorcar.
(US, Canada) A type of vehicle designed to move on the ground under its own stored power and intended to carry a driver, a small number of additional passengers, and a very limited amount of other load. A car or motorcar.