Noun: This is the most common usage. It refers to a female monarch.
* Example: The queen of England is known for her long reign.
Adjective: This is less common, but "queen" can be used as an adjective to describe something related to a queen.
* Example: The queen's jewels were on display at the museum.
Verb: While not frequently used, "queen" can be a verb meaning to act like a queen or to reign as a queen.
* Example: She queened it up at the party, wearing a tiara and a flowing gown.
Interjection: This is extremely rare, but "Queen!" can be used as an exclamation.
* Example: "Queen! You're amazing!"
So, the part of speech of "queen" depends on the context of the sentence.