Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Russian
то́нкий
→
Belarusian
тонкі
(cognate)
→
Latvian
tievs
(cognate)
→
Russian
тонко
(affix)
→
Russian
тонкость
(affix)
→
Russian
утончить
(affix)