Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
focleolaí
←
Irish
focal
(compound)
←
Irish
eolaí
(compound)
←
Proto-Indo-European
*wekʷ-
(root)