Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Catalan
rotund
←
Catalan
rodó
(doublet)
←
Latin
rotundus
(borrowed)
→
Catalan
rodó
(doublet)
→
Catalan
rotundament
(affix)