Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
letra
←
Ancient Greek
διφθέρα
(derived)
←
Latin
littera
(inherited)
←
Old Portuguese
letra
(inherited)
←
Old Portuguese
letera
(mention)