Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Ido
fonto
←
Latin
fontēs
(derived)
←
Latin
fons
(mention)
→
Ido
fontala
(affix)
→
Ido
fontolinguo
(compound)