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"Castilla" is a proper noun which is often translated as "Castile", and "castellano" is a noun which is often translated as "Castilian". Learn more about the difference between "Castilla" and "castellano" below.
la Castilla(
kahs
-
tee
-
yah
)A proper noun refers to the name of a person, place, or thing.
a. Castile
Durante un tiempo, el poder en Castilla lo compartieron cinco familias.At one time, power in Castile was shared by five different families.
el castellano(
kahs
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teh
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yah
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noh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
1. (language)
a. Castilian
Mi amigo gallego es español, pero no es castellano.My Galician friend is Spanish, but he's not Castilian.