Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
douar
→
Breton
douaroniezh
(mention)
→
Breton
douaroù
(suffix)
→
Breton
douarek
(suffix)
→
Breton
Douar-Nevez
(compound)