Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
argthóir
←
Irish
arg
(affix)
←
Irish
-tóir
(affix)
←
Middle Irish
airctheóir
(inherited)
←
Old Irish
orcaid
(derived)