| Radiator | radiator |
| Prädator | predator |
| Prädikator | predicator |
| Prädiktor | predictor |
| Radiation | adaptive radiation |
| Gladiator | gladiator |
| Pädiater | pediatrician |
| Radierer | eraser |
| Radikaler | radical |
| Radsatz | wheelset |
| radio- | radio- |
| Radar | radar |
| Radiant | radian radiant |
| Radio | radio |
| Radlader | loader |
| Radlager | wheel bearing |
| radial | radial radially |
| Plagiator | plagiarist |
| rabiat | rough ruthless |
| Animator | animator |