Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Luxembourgish Knapp
German Knopf (cognate)
English knob (cognate)
Proto-Germanic *knuppô (inherited)
Proto-Germanic *knappô (mention)
Proto-Germanic *knappa- (mention)
Middle High German knop (inherited)
Proto-West Germanic *knappō (mention)
Old High German (inherited)
Old High German knoph (mention)
Hunsrik Knupp (cognate)
Dutch knop (cognate)

German Knopf (cognate)
Alemannic German Chnopf (cognate)
Hunsrik Knopp (cognate)
Luxembourgish Patt (link)