Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
morvleydh
←
Cornish
mor
(compound)
←
Cornish
bleydh
(compound)
→
Cornish
morvleydhes
(suffix)