Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
llaeth
←
Proto-Brythonic
*llaɨθ
(inherited)
←
Latin
lactem
(derived)
→
Breton
laezh
(cognate)
→
Welsh
llaethferch
(compound)
→
Welsh
galaeth
(mention)
→
Welsh
llaethog
(suffix)