Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
tóe
←
Proto-Celtic
*tawsos
(inherited)
→
Irish
clois
(cognate)
→
Old Irish
tost
(mention)
→
Old Irish
contúaisi
(affix)