Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*kloustā
→
Welsh
clust
(inherited)
→
Irish
cluas
(inherited)
→
Irish
clois
(derived)
→
Scottish Gaelic
cluas
(inherited)
→
Manx
cleaysh
(inherited)
→
Old Irish
clúas
(inherited)