Translation:A car and a newspaper
Vehicles cover trucks and buses as well as cars or automobiles. A truck is not an automobile. An auto is a shortened word for an automobile which is a car. It is more confusing than that though because "automobile" refers to that fact that it is self-powered rather than drawn by a horse. The word "car" predates this use and so you will see "railway cars" pulled by trains and originally it was anything on wheels, even a charriot pulled by horses. The use now is such that "car" without any other words would mean "auto" or automobile. Technically, a bus which carries passengers could perhaps be considered an automotive vehicle and some people might consider that an automobile, but now people would say "bus" if that is what is meant. When the insurance company asks me what kind of car I have, I tell them I have a van. So a car is not just a coupe or sedan, but any ordinary passenger vehicle. My car license does not allow me to drive trucks , for example. Buses also require special training and license.
I assume when you say "truck" you mean "18-wheeler" or equivalent, and not "pickup truck". When I say "truck", its generally a pickup, not requiring any special licensing. I'd also say that "vehicle" covers any form of transportation (a bicycle is a self powered vehicle), an "automobile" is anything that is engine powered on the roads (a speedboat isn't an automobile, but a motorcycle or bus would fall into that category), and a "car" would typically be your standard sedan/coupe, although its typically used in conversation to mean "automobile". "What kind of car do you drive?" "I ride a motorcycle" (I wouldn't say I don't drive a car, because I know they're really asking about my mode of regular transportation.) Generally speaking, you can substitute just about anything for anything else and still get the idea across, even if it comes across a little rough. This is more for anyone who doesn't have enligsh as a primary language looking for a different perspective on how the categories are "defined".