Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
hogh
←
Proto-Celtic
*sukkos
(inherited)
←
Proto-Indo-European
*suh₁-
(derived)
→
English
hog
(cognate)
→
Cornish
morhogh
(compound)