Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Czech
kupec
←
Czech
koupit
(affix)
←
Czech
-ec
(affix)
←
Proto-Slavic
*kupьcь
(inherited)
→
Czech
knihkupec
(compound)
→
Romanian
cupeț
(cognate)