Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old East Slavic
бꙋкꙑ
←
Proto-Slavic
*buky
(inherited)
→
Polish
bukwa
(derived)
→
Russian
буква
(inherited)
→
Russian
буки
(inherited)
→
Ukrainian
буква
(derived)