Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old English
-þor
←
Proto-Germanic
*-þrą
(inherited)
←
Proto-Indo-European
*-trom
(inherited)
→
English
smother
(mention)