Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Dutch
obscuur
←
German
obskur
(mention)
←
English
obscure
(mention)
←
Old French
obscur
(derived)
←
Latin
obscūrus
(derived)