Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Occitan
canczon
←
Latin
cantiō
(inherited)
→
Catalan
cançó
(inherited)
→
Occitan
cançon
(inherited)
→
Old Portuguese
cançon
(derived)