Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
fordh
←
Old English
ford
(derived)
←
Breton
forzh
(cognate)
←
Proto-Brythonic
*forð
(inherited)
←
Middle Cornish
fordh
(inherited)
←
Welsh
fordh
(cognate)
←
Old Cornish
ford
(inherited)
→
Welsh
ffordd
(cognate)
→
Cornish
fordhow
(suffix)
→
Cornish
ponsfordh
(affix)