Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Bulgarian
площад
←
Bulgarian
пло́сък
(affix)
←
Bulgarian
-яд
(affix)
←
Russian
пло́щадь
(borrowed)
←
Proto-Slavic
*ploščadь
(derived)