Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
beudy
←
Proto-Celtic
*bowotegos
(inherited)
←
Proto-Celtic
*bāus
(mention)
←
Proto-Celtic
*tegos
(mention)
←
Welsh
bu
(compound)
←
Welsh
tŷ
(compound)