What part of speech is yellow?

"Yellow" can be a few different parts of speech depending on its context:

* Adjective: This is the most common use, describing a color. For example, "The sun is yellow."

* Noun: It can refer to the color itself. For example, "Yellow is my favorite color."

* Interjection: In rare cases, it can be used as an exclamation, like "Yellow! You're stepping on my toes!"

It's important to look at the sentence it's used in to determine the correct part of speech.