* As a color: "Yellow" is an adjective, describing a color.
* Example: "The sun is yellow."
* As a specific thing: "Yellow" can be a noun if it refers to a specific thing or concept associated with the color yellow.
* Example: "The yellow of the daffodils was vibrant."
* Example: "He loves the yellow of his favorite sports team."
Let me know if you have a specific sentence in mind, and I can help you figure out if "yellow" is functioning as a noun or an adjective!