* Adjective: Describing something as being more than what is usual or necessary.
* Example: "She wore an extra sparkly dress."
* Adverb: Modifying a verb, adjective, or other adverb, meaning "to an excessive degree."
* Example: "They were extra excited about the trip."
* Noun: Used to refer to something additional or supplementary.
* Example: "Let me add an extra teaspoon of sugar."
It's important to look at the context of the sentence to determine which part of speech "extra" is functioning as.