| Auto | car motor car auto order resolution writ |
| auto- | self- auto- |
| Autor | author literator |
| Autocue | autocue |
| Autobus | bus coach motorbus |
| Autocar | bus |
| Automat | vending machine |
| Autorin | author writer |
| Autosom | autosome |
| autogam | autogamous |
| autogen | autogenous |
| autonom | autonomous self-governed |
| Autobahn | motorway freeway highway interstate highway |
| Autodafé | auto-da-fé |
| Autodieb | car thief |
| Autodrom | motor-racing circuit dodgems track bumper car dodgem |
| Autogiro | autogyro autogiro |
| Autograf | autograph |
| Autohaus | car dealer car dealership |
| Autokauf | car purchase |