Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
senedh
←
Welsh
senedd
(mention)
←
Latin
senātus
(derived)
←
Latin
senex
(mention)
→
Cornish
senedhow
(suffix)