| irrationell | irrational |
| irrational | irrational |
| rationell | economic |
| Rationale | rationale |
| generationell | generational |
| arational | arational |
| rational | rational |
| sensationell | sensational |
| funktionell | functional |
| redaktionell | editorial |
| traditionell | traditional |
| okkasionell | occasional |
| Irritation | irritation |
| irritierend | bewildering |
| irritiert | annoyed |
| Irrationalität | irrationality |
| Irrigation | irrigation |
| irritieren | confuse disturb irritate |
| Oration | collect |
| Iteration | iteration |