Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Bulgarian
бояк
←
Bulgarian
бой
(affix)
←
Bulgarian
-ък
(affix)
←
Proto-Slavic
*bojьkъ
(inherited)