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