Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Norse
atdjúpr
←
Proto-Indo-European
*dʰewb-
(root)
←
Old Norse
at
(prefix)
←
Old Norse
djúpr
(prefix)