| Reflex | reflex |
| reflexiv | reflexive |
| Reflexion | reflection |
| Reflexbogen | reflex arc |
| reffen | reef |
| reflexartig | knee-jerk |
| Flex | angle grinder |
| Telex | telex |
| Referee | referee |
| Reff | reef |
| Reflexivität | reflexivity |
| Reform | reform |
| Refugee | refugee |
| Treffen | meeting encounter |
| treffen | meet hit affect |
| Treffer | hit |
| Retroflex | retroflex |
| retroflex | retroflex |
| Trifle | trifle |
| Silex | flint |