Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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English dow
Old English dugan (inherited)
Middle English douen (inherited)
Middle English dowen (inherited)
Old French douer (derived)
Proto-Germanic *duganą (inherited)
Proto-Indo-European *dʰewgʰ- (root)
Latin dōtō (derived)

English douth (link)
English dought (link)
English dowless (suffix)
English dowable (suffix)
English dog (cognate)
English dowsome (suffix)
German taugen (cognate)