Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
entullar
←
Galician
en-
(affix)
←
Galician
tulla
(affix)
←
Portuguese
entulhar
(cognate)
→
Galician
entullo
(back-formation)