| Rekursion | recursion |
| rekursiv | recursive |
| Exkursion | excursion field trip |
| Retorsion | retorsion retortion |
| Rektion | case government government |
| Evorsion | evorsion |
| Version | version |
| Revulsio | revulsion |
| Emulsion | emulsion |
| Perkussion | percussion |
| Revision | check change revision appeal audit |
| Rezension | recension review |
| Rezession | recession |
| Reduktion | reduction |
| Rektoskop | rectoscope |
| rekurrent | recurrent |
| Erektion | erection |
| Rektorin | headmistress |
| Rekuperation | recuperation |
| Rekurrenz | recurrence |