| Anöstrus | anestrus |
| abstrus | abstruse |
| Anonymus | anonym |
| Angström | angstrom |
| Notruf | emergency call |
| Anorak | anorak |
| Anorthit | anorthite |
| Anosmie | anosmia |
| Dinosaurus | dinosaur |
| Knossos | Knossos |
| Gnosis | gnosticism gnostics gnosis |
| Frosthub | frost heave |
| Ostrau | Ostrava |
| Postzug | mail train |
| Altostratus | altostratus |
| Aosta | Aosta |
| Apostat | apostate |
| Apostel | apostle |
| Apostroph | apostrophe |
| Hostess | hostess |