Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
comezo
←
Spanish
comienzo
(cognate)
←
Galician
comezar
(back-formation)
←
Portuguese
começo
(cognate)
←
Old Portuguese
começo
(inherited)