Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
trinchar
←
Old French
trenchier
(borrowed)
←
Galician
trincar
(doublet)
→
Galician
trincha
(back-formation)
→
Galician
trincar
(doublet)
→
Galician
trencha
(back-formation)