Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
colainn
←
Proto-Celtic
*kolannis
(inherited)
←
Proto-Indo-European
*kel-
(derived)
←
Old Irish
colinn
(inherited)
→
Welsh
celain
(cognate)
→
Irish
colann
(mention)
→
Irish
collaí
(affix)