Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
escuro
←
Latin
obscūrus
(inherited)
←
Old Portuguese
escuro
(inherited)
←
Old Portuguese
scuro
(mention)
←
Old Portuguese
oscuro
(mention)
→
Galician
escurecer
(suffix)