Here's why:
* It describes a noun: "Worst" tells us about the quality of something. For example, "This is the worst movie I've ever seen."
* It can be compared: We can use "worse" and "worst" to show degrees of something bad (e.g., "That's bad, but this is worse," and "This is the worst of all.")
Let me know if you have any other words you'd like to figure out! 😊