Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
mega-
←
Ancient Greek
μέγας
(derived)
→
Icelandic
megavatt
(affix)
→
Icelandic
megabæti
(affix)