Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Russian
бобёр
→
Belarusian
бабёр
(cognate)
→
Russian
бобрёнок
(affix)
→
Russian
бобровый
(affix)