Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Portuguese
purgar
←
Latin
purgāre
(derived)
←
Latin
purgō
(mention)
←
Latin
pūrus
(mention)
←
Latin
agō
(mention)