Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
cymwys
←
Welsh
cym-
(affix)
←
Welsh
pwys
(affix)
←
Cornish
kompes
(cognate)
←
Latin
compensus
(borrowed)
→
Welsh
yn gymwys
(compound)
→
Welsh
cymhwyster
(suffix)