Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Slavic
*grudьnъ
→
Old East Slavic
грудьнъ
(inherited)
→
Polish
grudzień
(inherited)
→
Ukrainian
грудень
(inherited)