Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Occitan
baratar
←
French
baratter
(cognate)
←
Old French
barateor
(derived)
←
Old French
barate
(mention)
←
Old French
barater
(mention)
←
Irish
brath
(cognate)
→
Galician
baratar
(cognate)