* Noun: This is the most common use. It refers to the quality of being funny or amusing.
* Verb: This is less common, but it means to indulge in humor.
* Adjective: This is also less common, but it means "humorous" or "funny."
Here are some examples:
* Noun: "The comedian's humor was very dry."
* Verb: "The kids humored their grandpa by playing his favorite game."
* Adjective: "His story was quite humorous."
In most cases, you'll encounter "humor" as a noun.