Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
cascallo
←
Spanish
cascajo
(cognate)
←
Galician
casca
(suffix)
←
Galician
allo
(suffix)
←
Portuguese
cascalho
(cognate)