| Doktorgrad | doctor's degree |
| Doktorat | doctorate |
| Doktorand | Ph.D. candidate Ph.D. student doctorand |
| Motorrad | bike motor-bike motor-cycle motorcycle |
| Doktorin | Doctor |
| doktorieren | doctor |
| doktrinal | doctrinal |
| doktrinär | doctrinaire |
| Doktor | doctor physican |
| Castor-Rad | caster |
| Fotograf | photographer |
| Wolgograd | Volgograd |
| Doktorandin | Ph.D. candidate Ph.D. student doctorand |
| Doktorarbeit | dissertation thesis |
| Doktorfisch | surgeonfish |
| Doktortitel | doctor's degree doctoral level |
| Doktorvater | supervisor thesis advisor |
| Doktrin | doctrine |
| Oktober | October |
| Oktogon | octagon |