Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
safna
←
Proto-Germanic
*samnōną
(derived)
←
Proto-Germanic
*samanōną
(mention)
←
Old Norse
samna
(derived)
←
Old Norse
safna
(mention)
→
Icelandic
safn
(mention)
→
Icelandic
safnari
(suffix)