Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
-oon
←
French
-on
(derived)
→
English
Cameroon
(mention)
→
English
spittoon
(affix)
→
English
goboon
(affix)