Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Polish
ósmy
←
Proto-Slavic
*osmъ
(inherited)
→
Belarusian
восьмы
(cognate)
→
Polish
ósmoklasista
(affix)