Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
mell
←
Proto-Celtic
*melsā
(derived)
←
Proto-Indo-European
*mel
(derived)
→
Ancient Greek
μέλος
(cognate)