Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Ido
poligono
←
German
Polygon
(derived)
←
English
polygon
(derived)
←
English
polygonum
(mention)
←
Esperanto
poligono
(derived)
←
Spanish
polígono
(derived)
←
French
polygone
(derived)
←
Italian
poligono
(derived)
←
Russian
полиго́н
(derived)