German Doktor

← Latin doctor (derived)

→ German Doktorin (suffix)

→ German Doktorarbeit (compound)

→ German Doktorvater (affix)

→ German Doktorfisch (compound)

→ German Ehrendoktor (compound)

→ German doktern (suffix)

→ Romanian doctor (borrowed)

→ Volapük dokan (borrowed)