Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
French
cohue
←
Breton
koc'hu
(cognate)
←
Breton
koc'hui
(mention)
←
Proto-Brythonic
*hwɨβid
(derived)
←
Welsh
cy-
(cognate)
←
Welsh
chwyf
(mention)
←
Middle Breton
cochuy
(derived)