Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
West Frisian
keapje
←
Old Frisian
kāpia
(inherited)
→
North Frisian
kuupe
(cognate)
→
West Frisian
ferkeapje
(affix)
→
Saterland Frisian
koopje
(cognate)