Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle French
demonstrer
←
Old French
demonstrer
(inherited)
←
Old French
demoustrer
(mention)
←
Latin
dēmonstrō
(derived)
→
French
démontrer
(inherited)