| Refektorium | refectory |
| Direktorium | board of directors |
| Offertorium | offertory |
| Refactoring | refactoring |
| Reflektor | reflector |
| Defektivum | defective |
| Insektarium | insectarium |
| Nektarium | floral nectary honey leaf nectary |
| Rektorin | headmistress |
| Raspatorium | xyster |
| Krematorium | crematory crematorium |
| Territorium | territory |
| Refaktorierung | refactoring |
| Reflektion | reflection |
| Referendum | referendum |
| Reform | reform |
| Refraktor | refracting telescope refractor |
| Refugium | refuge |
| defektiv | defective |
| Perfektum | perfective aspect |