Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Catalan
estotjar
←
Catalan
estojar
(mention)
←
Catalan
estudiar
(doublet)
←
Latin
studium
(derived)
→
Catalan
estoig
(mention)