Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
asluí
←
Proto-Celtic
*luweti
(derived)
←
Old Irish
ess-
(affix)
←
Old Irish
as·luí
(mention)
←
Old Irish
luïthir
(mention)