Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Belarusian
мрок
←
Belarusian
мо́рак
(doublet)
←
Polish
mrok
(borrowed)
←
Proto-Slavic
*mȏrkъ
(derived)
→
Belarusian
морак
(doublet)