Auto and Squad car

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

Squad car and auto are semantically related. In some cases you can replace phrase "Squad car" with "Auto", this terms are similar.

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

Auto and squad car are semantically related. Sometimes you can use "Auto" instead a noun phrase "Squad car".