| Irredentist | irredentist |
| Irredentistin | irredentist |
| Irredentismus | irredentism |
| Irrenanstalt | madhouse |
| irreleiten | beguile |
| irrelevant | irrelevant |
| Redekunst | oratory |
| Redeweise | idiom |
| Redensart | idiom locution saying |
| Identität | identity |
| identisch | identical identic |
| Regentin | regent |
| Riesentier | behemoth |
| Adventist | Adventist |
| Argentit | argentite |
| Drogentest | drug test |
| Retention | retention |
| Esperantist | Esperantist |
| Idealist | visionary idealist |
| Reservist | reservist |