| altklug | precocious |
| weltklug | worldly-wise |
| Altbau | old building |
| Altglas | waste glass |
| Althing | Althing |
| Altöl | used oil waste oil |
| alteln | age |
| unklug | imprudent |
| Aeroklub | aero club |
| klug | smart clever wise judicious prudent intelligent |
| Abflug | departure takeoff |
| Anflug | approach touch |
| Ausflug | outing |
| Auslug | crow's nest lookout |
| Alt- | legacy |
| Altai | Altay Altai |
| Altair | Altair |
| Altarm | oxbow lake |
| Altern | aging |
| altern | age |