Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Portuguese
castrejo
←
Galician
castrexo
(cognate)
←
Portuguese
castro
(suffix)
←
Portuguese
ejo
(suffix)
→
Portuguese
castro
(link)