Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
ailt
←
Proto-Celtic
*altos
(inherited)
←
Welsh
allt
(cognate)
←
Irish
alt
(alter)
←
Irish
ált
(alter)
←
Irish
(alter)
←
Irish
Ulster
(alter)
←
Irish
ailteán
(link)
←
Irish
ail
(link)
←
Irish
aill
(link)
←
Middle Irish
alt
(inherited)
→
Welsh
allt
(cognate)
→
Irish
ailteán
(affix)
→
Irish
altán
(mention)