However, if you are asking for the Spanish word for "Spanish" (the language), it's español.
Here's a breakdown:
* Español (pronounced "eh-spahn-yol"): This is the most common and formal word for the Spanish language.
* Castellano (pronounced "kas-teh-yah-noh"): This is the official name of the Spanish language in Spain.
Let me know if you have any other questions!