Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
cuspir
←
Latin
cōnspuō
(inherited)
←
Old Portuguese
cospir
(inherited)
→
Galician
cuspe
(back-formation)