Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
traaoil
←
Irish
tráthúil
(cognate)
←
Manx
traa
(suffix)
←
Manx
oil
(suffix)
←
Old Irish
tráthamail
(inherited)