| Zirrus | cirrus |
| Zirkus | circus |
| Virus | virus |
| Zirmet | hartwort |
| Zirpen | chirp |
| zirpen | chirp |
| zirka | approximate |
| Zirbel | Swiss stone pine arolla pine |
| Zirkel | compass pair of compasses circle |
| Zirkon | zircon |
| Zirrhose | cirrhosis |
| Girren | coo |
| girren | coo |
| Irre | madwoman astray lunatic |
| irre | crazy insane mad |
| Irrer | crazy |
| Irrtum | mistake error fallacy misapprehension |
| Wirren | disturbances riots |
| irren | be mistaken err roam wander |
| irrig | errorneous mistaken |