Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
clarsach
←
Proto-Celtic
*klāros
(derived)
←
Proto-Celtic
*klārom
(mention)
←
Irish
cláirseach
(cognate)
←
Scottish Gaelic
clàrsach
(borrowed)
←
Scottish Gaelic
clàr
(mention)