Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Slavic
*rъpъtъ
→
Bulgarian
ропот
(inherited)
→
Romanian
ropot
(derived)
→
Russian
ропот
(inherited)