Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Romanian
obște
←
Old Church Slavonic
обьщь
(borrowed)
←
Proto-Slavic
*obьťь
(derived)
→
Romanian
obștește
(suffix)