| Ornithopter | ornithopter |
| Ornithose | ornithosis |
| Ornithologe | ornithologist |
| Orthoepie | orthoepy |
| Ornithin | ornithine |
| Ornithochorie | ornithochory |
| Ornithologie | ornithology |
| Ornithologin | ornithologist |
| Tornister | knapsack satchel |
| Vernichter | annihilator confector |
| Knitter | crease |
| Sanitäter | paramedic |
| Reithalfter | noseband |
| Reithose | riding breeches |
| Obsthöker | fruiterer |
| Orthoptist | orthoptist |
| Orthopäde | orthopedist orthopaedist orthopaedic specialist orthopedic specialist orthopedic surgeon |
| Tonschöpfer | composer |
| Diopter | diopter |
| Helikopter | helicopter |