Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
comhchreidmheach
←
Irish
comh
(prefix)
←
Irish
creidmheach
(prefix)
→
Manx
co-chredjuagh
(cognate)