Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
táin
←
Proto-Celtic
*to-
(derived)
←
Proto-Celtic
*ageti
(derived)
←
Proto-Indo-European
*h₂eǵ-
(root)
←
Proto-Indo-European
*h₂eǵ-
(derived)
←
Old Irish
táin
(inherited)
←
Old Irish
do·aig
(mention)