Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
rheg
←
Welsh
rhegi
(mention)
←
Proto-Indo-European
*preḱ-
(derived)
→
Welsh
rhegen
(mention)
→
Welsh
anrheg
(prefix)
→
Welsh
anrheg
(prefix)
→
Welsh
rhegfa
(compound)