Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
English droff
Old English drōf (inherited)
German trüb (cognate)
English trub (mention)
Middle English drof (inherited)
Proto-Germanic *drōbuz (inherited)
Dutch droef (cognate)

English trub (mention)
English dreve (mention)
English drubly (mention)
German trüb (cognate)
Dutch droef (cognate)