Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Belarusian
-осць
←
Polish
-ość
(cognate)
←
Russian
-ость
(cognate)
←
Proto-Slavic
*-ostь
(inherited)
←
Ukrainian
-ість
(cognate)