Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
West Frisian keap
Proto-West Germanic *kaup (inherited)
Old Frisian kāp (inherited)

English cheap (cognate)
German Kauf (cognate)
North Frisian kuup (cognate)
West Frisian goedkeap (compound)
West Frisian keapstêd (compound)