Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle French
eur
→
Middle French
resveur
(suffix)
→
Middle French
beuveur
(suffix)
→
Middle French
prognosticqueur
(suffix)
→
Middle French
deffendeur
(suffix)