* Adjective: Describing a noun. Example: "That's a nice car."
* Adverb: Modifying a verb, adjective, or other adverb. Example: "He sings nice." (Though it's more common to use "nicely" in this context.)
* Interjection: Expressing a sudden feeling. Example: "Nice!"
Let me know if you have a specific sentence in mind and I can tell you the part of speech for "nice" in that context!