Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Portuguese
racional
→
Portuguese
racionalizar
(affix)
→
Portuguese
racionalmente
(affix)
→
Portuguese
racionalismo
(affix)
→
Portuguese
antirracional
(affix)