Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
ugens
←
Proto-Celtic
*wikantī
(inherited)
→
Welsh
ugain
(cognate)
→
Cornish
peswar ugens
(compound)
→
Cornish
ugensves
(affix)
→
Cornish
nownsek ha peswar ugens
(compound)