Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Albanian
kyç
←
Bulgarian
ключ
(cognate)
←
Old Church Slavonic
ключь
(cognate)
←
Serbo-Croatian
ključ
(cognate)
←
Proto-Slavic
*kľučь
(derived)