What part of speech is separate in some buildings have classrooms?

The word "separate" in the sentence "Some buildings have separate classrooms" is an adjective.

Here's why:

* It modifies the noun "classrooms": It tells us what kind of classrooms they are (separate).

* Adjectives describe or qualify nouns: This is the primary function of adjectives.

Let me know if you have any other words you'd like to analyze!