Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
somorgullar
←
Spanish
somorgujar
(cognate)
←
Galician
so
(prefix)
←
Galician
mergullar
(prefix)
→
Galician
somorgullo
(back-formation)