Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Portuguese
flutuar
←
Latin
fluctuāre
(learned borrowing)
←
Latin
fluctuō
(mention)
→
Portuguese
flutuação
(suffix)
→
Portuguese
flutuador
(suffix)