Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Ukrainian
посередник
←
Belarusian
пасрэ́днік
(cognate)
←
Polish
pośrednik
(cognate)
←
Russian
посре́дник
(cognate)
←
Ukrainian
посере́дній
(affix)
←
Ukrainian
-ник
(affix)