Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Slavic
*kъlkъ
→
Romanian
câlți
(mention)
→
Serbo-Croatian
kuk
(inherited)
→
Serbo-Croatian
кук
(inherited)