What part of speech is the word fun?

"Fun" can be a few different parts of speech depending on its context:

* Noun: When referring to the state of being enjoyable or amusing.

* Example: "We had a lot of fun at the party."

* Adjective: When describing something as enjoyable or amusing.

* Example: "It was a fun movie."

* Interjection: When expressing excitement or enjoyment.

* Example: "Fun! Let's go to the beach!"

The specific part of speech will be determined by how it is used in a sentence.