* Noun: This is the most common usage. It refers to a reduction in price.
* Example: "The store offered a 10% discount on all items."
* Verb: It means to reduce the price of something.
* Example: "They discounted the old model to make room for the new one."
* Adjective: It describes something that has been reduced in price.
* Example: "Those are discount shoes."
So, the part of speech depends on its function in the sentence.