Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
North Frisian
suurt
←
Proto-Germanic
*swartaz
(inherited)
←
Old Frisian
swart
(inherited)
←
Old Frisian
swert
(mention)
→
North Frisian
suart
(cognate)