Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
brill
←
English
brilliant
(mention)
←
Cornish
brilli
(derived)
←
Cornish
brithelli
(mention)
←
Cornish
brithel
(mention)
←
Cornish
brith
(mention)