Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
cosc
←
Welsh
cosb
(cognate)
←
Irish
coscadh
(link)
←
Irish
gan chosc
(link)
←
Irish
gan chosc gan cheangal
(link)
←
Old Irish
cosc
(inherited)
→
Welsh
cosb
(cognate)
→
Irish
coisceas
(suffix)