| Osteroktav | Octave of Easter |
| Ostermontag | Easter Monday |
| Ostertag | Easter Day |
| Osteoklast | osteoclast |
| Osteria | osteria |
| Osterputz | spring cleaning |
| Ostersonntag | Easter Sunday |
| Osteuropa | Eastern Europe East Europe |
| Osteuropäer | Eastern European |
| Ostfront | eastern front |
| ostentativ | ostentatious ostentation |
| Sterntag | sidereal day |
| interaktiv | interactive |
| Osterlamm | Paschal Lamb |
| Ostermond | April |
| Ostrau | Ostrava |
| Ostrava | Ostrava |
| Röstbrot | toast |
| osteo- | osteo- |
| Ostafrika | East Africa |