Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
Pendarvis
←
Cornish
Pendarves
(derived)
←
Cornish
pen
(mention)
←
Cornish
dar
(mention)
←
Cornish
vez
(mention)