What type of word is blue?

"Blue" can be a few different types of words, depending on the context:

* Adjective: Describing a color, like "The sky is blue."

* Noun: Referring to the color itself, like "Blue is my favorite color."

* Verb: In some cases, it can be a verb meaning to become sad or depressed, like "She felt blue after the loss."

So, it depends on the specific sentence and how it's used!