Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
skouarn
←
Proto-Celtic
*skob-erna
(inherited)
←
Welsh
ysgyfarn
(cognate)
←
Proto-Indo-European
*(s)kewh₁-
(inherited)
←
Cornish
skovarn
(cognate)
←
Old Breton
scobarn
(inherited)
→
Breton
divskouarn
(affix)
→
Cornish
skovarn
(cognate)