Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Russian
Бе́льгия
→
Mongolian
Бельги
(borrowed)
→
Russian
бельгийский
(affix)
→
Russian
бельгиец
(affix)
→
Russian
бельгийка
(affix)