Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
brehon
←
Irish
breitheamhan
(mention)
←
Irish
breitheamhain
(mention)
←
Irish
breitheamh
(derived)
←
Old Irish
brithem
(derived)
←
Old Irish
breth
(mention)