Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Bulgarian
паяк
←
Bulgarian
па-
(prefix)
←
Bulgarian
*h₂énkos
(prefix)
←
Proto-Slavic
*pajękъ
(inherited)
←
Proto-Slavic
*paǫkъ
(cognate)