Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Russian
клас
←
Old Church Slavonic
класъ
(borrowed)
←
Russian
ко́лос
(doublet)
←
Proto-Slavic
*kolsъ
(derived)