What part of speech is the word green?

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

* Adjective: Describing a color. Example: "The grass is green."

* Noun: Referring to the color itself. Example: "Green is my favorite color."

* Verb: To become green. Example: "The leaves are greening."

So, to determine the part of speech, you need to look at the context of the sentence.