Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Portuguese
obrigação
←
Latin
obligatio
(derived)
←
Old Portuguese
obrigaçon
(inherited)
←
Old Portuguese
obligaçon
(mention)
→
Galician
obrigación
(cognate)