Here's why:
* Noun: A word that names a person, place, thing, or idea. "Graphic" in this case functions as an adjective modifying the noun "aid."
* Phrase: A group of related words that functions as a single unit of meaning. "Graphic aid" works together to describe a specific type of aid, often used in presentations or for visual communication.
Therefore, "graphic aid" acts as a noun phrase in a sentence. For example:
"The speaker used a graphic aid to illustrate the data."