| Nautilus | nautilus |
| Nautik | nautical science |
| nautisch | nautical nautically navigational |
| Autismus | autism |
| Autobus | bus coach motorbus |
| lautlos | silent noiseless soundless |
| Atilius | Atilius |
| Paulus | Paul |
| Saulus | Saul |
| Daktylus | dactyl |
| Nauru | Nauru |
| Nauruer | Nauruan |
| Autist | autist autistic person |
| Autocue | autocue |
| Autohaus | car dealer car dealership |
| Autolyse | autolysis |
| Bauteil | component component part element |
| Hautgout | gamey flavour haut gout |
| Kautel | proviso |
| Kaution | bail deposit |