Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Latin
observo
←
Latin
ob-
(affix)
←
Latin
servō
(affix)
→
English
observandum
(mention)
→
French
observer
(mention)