Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Esperanto
-opo
→
Esperanto
opo
(back-formation)
→
Esperanto
duopo
(affix)
→
Esperanto
okopo
(affix)
→
Esperanto
triopo
(affix)