Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
fead
←
Proto-Indo-European
*h₂weh₁-
(root)
←
Old Irish
fet
(inherited)
→
Irish
feadóg
(affix)
→
Irish
feadán
(affix)
→
Manx
feddan
(cognate)