Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
cascar
←
Latin
quassāre
(derived)
←
Latin
quassō
(mention)
→
Galician
casco
(back-formation)
→
Galician
casca
(back-formation)