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