Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Occitan
uòu
←
Catalan
ou
(cognate)
←
French
œuf
(cognate)
←
Latin
ōvum
(inherited)
→
Catalan
ou
(cognate)