| radioaktiv | radioactive |
| Radioaktivität | radioactivity |
| Prädikativ | predicative predicative expression |
| prädikativ | predicative predicatively |
| bioaktiv | bioactive |
| Radiolarie | radiolarian |
| Radionuklid | radionuclide |
| Radiotaste | radio button |
| Radiant | radian radiant |
| Radiation | adaptive radiation |
| Radiator | radiator |
| Radiologie | radiology |
| Radiologin | radiologist |
| Radiometer | radiometer |
| proaktiv | proactive |
| inaktiv | dormant |
| nachtaktiv | nocturnal |
| Didaktik | didactics |
| attraktiv | attractive |
| reaktiv | reactive |