Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
amzer
←
Welsh
amser
(cognate)
←
Irish
aimsir
(cognate)
→
Breton
diskar-amzer
(compound)
→
Breton
nevezamzer
(compound)
→
Irish
aimsir
(cognate)