| Doktrin | doctrine |
| doktrinal | doctrinal |
| doktrinär | doctrinaire |
| Doktorin | Doctor |
| Dextrin | dextrin |
| Dakerin | Dacian |
| Doktorat | doctorate |
| Doktor | doctor physican |
| Doktorand | Ph.D. candidate Ph.D. student doctorand |
| endokrin | endocrine |
| Baktrien | Bactria |
| Ametrin | ametrine |
| Dmitri | Dmitry |
| Citrin | citrine |
| Dioptrie | diopter dioptre |
| Bikerin | biker |
| Boxerin | boxer |
| Donatorin | giver |
| Imkerin | beekeeper |
| Karin | Karin |