Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
rudh
←
Proto-Brythonic
*rrʉð
(inherited)
←
Proto-Celtic
*roudos
(inherited)
←
Proto-Indo-European
*h₁rewdʰ-
(derived)
→
Cornish
rudhvelyn
(compound)
→
Cornish
gwynnrudh
(compound)
→
Cornish
glasrudh
(compound)
→
Cornish
melynrudh
(compound)
→
Cornish
rudhwynn
(compound)
→
Cornish
rudhlas
(compound)
→
Cornish
karten rudh
(affix)