Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
bóla
←
Galician
bola
(doublet)
←
Latin
bulla
(derived)
←
Old Occitan
bola
(borrowed)
→
Galician
bula
(doublet)
→
Galician
bola
(doublet)