Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
taoiseach
←
Proto-Celtic
*towissākos
(mention)
←
Irish
taoiseach
(mention)
←
Primitive Irish
ᚈᚑᚃᚔᚄᚐᚉᚔ
(mention)
←
Old Irish
toísech
(mention)