Here's why:
* Simile: A comparison using "like" or "as." For example, "The cat is *like* a furry cloud."
* Metonymy: A figure of speech where a word or phrase is used to stand in for something else it's closely associated with.
In this case, "cheesy cat" doesn't directly compare the cat to something else. Instead, it uses the phrase "cheesy" to represent the cat's characteristic grin, which is often associated with cheesiness.
Therefore, "cheesy cat" uses metonymy to describe the cat's grin.