Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
Godhal
→
Cornish
Godhalek
(suffix)
→
Cornish
Godhales
(suffix)
→
Cornish
godhalek
(suffix)