Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
caithir
←
Irish
caithear
(alter)
←
Irish
cathair
(alter)
←
Irish
caithreach
(link)
←
Old Irish
caithir
(inherited)