| Reflektor | reflector |
| Deflektor | deflector |
| Reflektion | reflection |
| Refraktor | refracting telescope refractor |
| Elektor | elector |
| Selektor | selector |
| Reflexion | reflection |
| refraktär | refractory |
| Kollektor | collector |
| Lektor | lector reader lecturer literary editor |
| Detektor | detector receiver |
| Rektor | rector principal |
| Reaktor | reactor |
| Rezeptor | receptor |
| Refektorium | refectory |
| Referrer | referrer |
| Reformator | reformer |
| Reflex | reflex |
| reflektieren | reflect to be interested |
| reflexiv | reflexive |