Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Church Slavonic
ѥзеръ
←
Proto-Balto-Slavic
*eźera-
(derived)
←
Proto-Slavic
*ezero
(inherited)