| refraktär | refractory |
| Refraktor | refracting telescope refractor |
| Reflektor | reflector |
| Fraktal | fractal |
| fraktal | fractal |
| Fraktur | fracture blackletter script |
| Reaktor | reactor |
| Reformator | reformer |
| Referat | report lecture presentation talk paper project department division unit |
| Referendar | student teacher trainee teacher |
| Refrain | refrain |
| Befrager | interviewer pollster |
| Gefreiter | lance corporal corporal |
| Befrachter | shipper |
| Charakter | character personality |
| Tetraktys | tetractys |
| Traktat | treatise tract treaty |
| Traktor | tractor |
| Reaktant | reactant |
| Einakter | one-act play |