Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
coracle
←
Proto-Celtic
*kurukos
(derived)
←
Irish
curach, corrach
(cognate)
←
Cornish
gorhel
(cognate)