| Rücktitration | back titration |
| Titration | titration |
| Rückrufaktion | product recall recall action |
| Restitution | restitution |
| Substitution | substitution replacement |
| Frustration | frustration exasperation |
| Kastration | castration |
| Lustration | lustration |
| Lukubration | lucubration |
| Rekuperation | recuperation |
| Restauration | restoration |
| Auskultation | auscultation |
| Guttation | guttation |
| Mutilation | mutilation |
| Rezitation | recitation |
| Rumination | rumination |
| Rückenkratzer | backscratcher |
| Rückenkraulen | backstroke |
| Rückgrat | backbone spine backbone chain |
| Rücktritt | resignation back pedal brake coaster brake |