Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
dochum
←
Middle Irish
tochim
(cognate)
←
Old Irish
do·cing
(mention)
→
Irish
chum
(derived)
→
Irish
chun
(derived)