Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
French
octante
←
French
huitante
(doublet)
←
Latin
octoginta
(borrowed)
→
French
huitante
(doublet)
→
French
octantième
(suffix)
→
French
octante-neuf
(compound)
→
French
octante-et-un
(compound)