Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
West Frisian
hert
←
Proto-West Germanic
*hertā
(inherited)
←
Old Frisian
herte
(inherited)
→
North Frisian
hart
(cognate)