Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Czech
třeň
←
Czech
čeřen
(doublet)
←
Polish
trzon
(borrowed)
←
Proto-Slavic
*čẽrnъ
(derived)