Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
te
←
Proto-Indo-European
*tep-
(root)
←
Old Irish
té
(inherited)
→
Irish
teo-
(mention)
→
Irish
teocht
(affix)
→
Irish
alathe
(mention)