Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
-athlon
←
Ancient Greek
ἆθλον
(borrowed)
←
Proto-Indo-European
*h₂weh₁-
(root)
→
English
decathlon
(affix)