What is another word for Spain?

There isn't a single perfect synonym for "Spain" because it's a proper noun. However, depending on the context, you might consider these options:

For the country:

* Iberia: This is a geographical term referring to the Iberian Peninsula, which includes Spain and Portugal.

* The Spanish State: A more formal term, often used in official contexts.

* España: The Spanish name for Spain.

For the people:

* Spanish: This refers to the people, language, or culture of Spain.

For the language:

* Castilian: This is the official language of Spain.

Ultimately, the best substitute for "Spain" depends on the specific situation and what you want to emphasize.