Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Bulgarian
лук
←
Proto-Germanic
*laukaz
(derived)
←
Proto-Slavic
*lukъ
(inherited)
→
Bulgarian
луча
(affix)
→
Russian
лук
(cognate)