Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Ancient Greek
χήρ
←
Proto-Indo-European
*ǵʰḗr
(derived)
←
Latin
ēr
(cognate)
→
Latin
er
(cognate)