Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
reachtach
←
Irish
reacht
(affix)
←
Irish
-ach
(affix)
←
Proto-Indo-European
*h₃reǵ-
(root)
←
Middle Irish
rechtach
(inherited)
→
Irish
reachtóir
(link)