Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
North Frisian
buk
←
North Frisian
bök
(cognate)
←
West Frisian
boek
(cognate)
←
Old Frisian
bōk
(inherited)