Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Esperanto
ĝemelo
←
Spanish
gemelo
(derived)
←
Italian
gemello
(derived)
←
Portuguese
gêmeo
(derived)
→
Esperanto
Ĝemelturoj
(compound)