Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old East Slavic
оболость
→
Belarusian
вобласць
(cognate)
→
Russian
область
(cognate)
→
Rusyn
область
(cognate)
→
Ukrainian
область
(cognate)