Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Catalan
llac
←
Proto-Indo-European
*lókus
(inherited)
←
Proto-Italic
*lakus
(inherited)
←
Latin
lacus
(inherited)
→
French
lac
(cognate)
→
Franco-Provençal
lac
(cognate)
→
Romanian
lac
(cognate)
→
Sardinian
lagu
(cognate)