Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Occitan
foc
←
Old French
fu
(cognate)
←
Latin
focus
(inherited)
→
Catalan
foc
(inherited)
→
Occitan
fuòc
(inherited)
→
Old Portuguese
fogo
(cognate)