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