Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Bulgarian
съм
←
Old Church Slavonic
бꙑти
(inherited)
←
Proto-Slavic
*byti
(inherited)
←
Proto-Slavic
*jesmь
(mention)
→
Bulgarian
същ
(mention)