Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Portuguese
unir
←
Proto-Indo-European
*óynos
(derived)
←
Old Latin
oinos
(derived)
←
Latin
ūnīre
(derived)
←
Latin
ūniō
(mention)
←
Latin
ūnus
(mention)
→
Portuguese
reunir
(affix)
→
Portuguese
desunir
(affix)