Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Serbo-Croatian
os
←
Proto-Slavic
*osь
(inherited)
→
Macedonian
оска
(cognate)
→
Romanian
osie
(cognate)