Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Ancient Greek
-ου
←
Proto-Hellenic
*-ohyo
(inherited)
←
Proto-Indo-European
*-os
(derived)
→
Norwegian Bokmål
-on
(derived)
→
Norwegian Bokmål
aceton
(derived)