Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Belarusian
морак
←
Belarusian
мрок
(doublet)
←
Russian
мо́рок
(cognate)
←
Proto-Slavic
*morkъ
(inherited)