Motorcar and Patrol car

Motorcar noun - A self-propelled passenger vehicle on four wheels.

Patrol car and motorcar are semantically related. In some cases you can replace phrase "Patrol car" with "Motorcar", this terms are similar.

Patrol car noun - A car in which policemen cruise the streets; equipped with radiotelephonic communications to headquarters.

Motorcar and patrol car are semantically related. Sometimes you can use "Motorcar" instead a noun phrase "Patrol car".