Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Occitan
clavar
←
Latin
clāvis
(mention)
←
Latin
clāvō
(mention)
←
Latin
clāvus
(inherited)
←
Occitan
clau
(suffix)
←
Occitan
ar
(suffix)
←
Old Occitan
(inherited)
→
Catalan
clavar
(cognate)