Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
aichear
←
Proto-Indo-European
*h₂eḱ-
(root)
←
Proto-Indo-European
*h₂ḱrós
(derived)
←
Proto-Indo-European
*h₂eḱ-
(derived)
←
Latin
ācer
(derived)
←
Old Irish
aicher
(inherited)
→
Irish
aichre
(affix)