| Radius | radius |
| Radium | radium |
| Radix | primitive |
| radio- | radio- |
| Radau | racket |
| Radio | radio |
| radial | radial radially |
| Arcadius | Arcadius |
| Roadium | Roadian |
| Vadium | bid bond |
| Arius | Arius |
| Darius | Darius |
| Marius | Marius |
| Rada | rada |
| prädial | praedial |
| rädern | break on the wheel |
| Paradies | Paradise paradise narthex |
| Rad | wheel bicycle bike cartwheel rad |
| Radar | radar |
| Radiant | radian radiant |