Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Slavic
*tučьnъ
→
Bulgarian
тучен
(inherited)
→
Czech
tučný
(inherited)
→
Polish
tuczny
(inherited)
→
Russian
тучный
(inherited)