| Subject |
|---|
| office [1] |
| offices [1] |
| open air theatre [1] |
| open space [2] |
| open-air theatre [1] |
| opening [1] |
| optic [1] |
| optical company [1] |
| optická firma [1] |
| optics [1] |
| optika [2] |
| optimalizovaný dům [1] |
| optimized house [1] |
| oslava [1] |
| Ostrava [1] |
| ostrov [1] |
| osvetlenie [1] |
| osvětlení [1] |
| otevřený prostor [1] |
| Outbuilding [1] |