| autogen | autogenous |
| Autorin | author writer |
| autogam | autogamous |
| fotogen | photogenic |
| Antigen | antigen |
| Mutagen | mutagen |
| mutagen | mutagenic |
| Häutchen | membrane |
| auto- | self- auto- |
| Auto | car motor car auto order resolution writ |
| Autobahn | motorway freeway highway interstate highway |
| Autobus | bus coach motorbus |
| Autocar | bus |
| Autocue | autocue |
| Autodieb | car thief |
| Autogiro | autogyro autogiro |
| Autograf | autograph |
| Autokino | drive-in drive-in cinema drive-in theater |
| Automat | vending machine |
| Autor | author literator |