Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Norse
fimmtigi
←
Proto-Germanic
*fimf tigiwiz
(inherited)
←
Old Norse
fimm
(suffix)
←
Old Norse
-tigi
(suffix)