Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
obversant
←
English
ob-
(affix)
←
Latin
obversans
(derived)
←
Latin
obversari
(mention)
←
Latin
ob
(mention)
←
Latin
versare
(mention)