| Zirkon | zircon |
| Zirkonium | zirconium |
| Zirpen | chirp |
| zirpen | chirp |
| zirka | approximate |
| Zirkel | compass pair of compasses circle |
| Zirkus | circus |
| Wirken | legacy |
| wirken | work act operate take effect appear seem knit |
| birken | birchen |
| Diakon | deacon |
| Ikon | icon |
| Zirmet | hartwort |
| Zirbel | Swiss stone pine arolla pine |
| Zirrus | cirrus |
| Kirke | Circe |
| Birke | birch |
| Dirk | topping lift |
| Wirkung | effect impact |
| Sarkom | sarcoma |