Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old East Slavic
суморокъ
→
Belarusian
змрок
(cognate)
→
Russian
сумерки
(derived)
→
Russian
сумрак
(cognate)