What part of speech is the word black?

The word "black" can be several parts of speech, depending on how it's used in a sentence:

* Adjective: Describing a color.

* Example: "The cat is black."

* Noun: Referring to the color itself.

* Example: "The artist used black and white in the painting."

* Verb: To make something dark or obscure.

* Example: "The storm clouds blackened the sky."

So, without more context, it's impossible to say definitively what part of speech "black" is.