Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Bulgarian
стълба
←
Bulgarian
стълб
(affix)
←
Bulgarian
-а
(affix)
←
Proto-Slavic
*stъlba
(inherited)
→
Bulgarian
стълбище
(affix)