Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
pelexar
←
Spanish
pelear
(cognate)
←
Latin
pilus
(derived)
←
Portuguese
pelejar
(cognate)
←
Old Portuguese
pelejar
(inherited)
→
Galician
pelexa
(back-formation)