* Adjective: Describing something that was shouted.
* Example: "He gave a shouted warning."
* Part of a verb phrase: Combined with a helping verb to form a verb tense.
* Example: "He had shouted at the top of his lungs."
* Noun: A rarer use, referring to an act of shouting.
* Example: "The shouted were loud enough to be heard from across the street." (This is uncommon and could sound awkward.)
In most cases, "shouted" functions as an adjective or part of a verb phrase.