| Optimist | optimist |
| Optimistin | optimist |
| optimistisch | optimistic |
| Optimat | optimate |
| Optimum | optimum |
| Optimismus | optimism |
| optimal | optimal optimum |
| Animist | animist |
| Latinist | Latinist |
| Aktivist | activist |
| Stilist | stylist |
| Optometrist | optometrist |
| Optativ | optative optative mood |
| Optik | optics |
| Optiker | optician |
| Optimatin | optimate |
| Option | option |
| optieren | opt |
| optimieren | optimize |
| optional | optional |