Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Slavic
*ploščadь
→
Belarusian
плошча
(inherited)
→
Bulgarian
площад
(derived)
→
Russian
площадь
(inherited)