Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Norse
*blettr
→
English
blot
(cognate)
→
Faroese
blettur
(derived)
→
Icelandic
blettur
(derived)