Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Bulgarian
червей
←
Bulgarian
*čьrvь
(affix)
←
Bulgarian
-ей
(affix)
←
Proto-Slavic
*čьrvьjь
(inherited)