Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
gwir
←
Proto-Brythonic
*gwir
(inherited)
←
Proto-Celtic
*wīros
(inherited)
←
Proto-Indo-European
*weh₁ros
(inherited)
→
Welsh
cywir
(prefix)
→
Welsh
gwirfoddol
(compound)