Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
kjaftur
←
Old Norse
kjaptr
(inherited)
→
Faroese
kjaftur
(cognate)
→
Icelandic
samkjafta
(prefix)
→
Icelandic
kjafta
(mention)