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