Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
esbonio
←
English
expound
(cognate)
←
Latin
exponere
(derived)
→
Welsh
esboniad
(affix)
→
Welsh
esboniadwy
(affix)