What part of speech is sand?

"Sand" can be several parts of speech depending on how it's used in a sentence:

* Noun: This is the most common usage. It refers to the material itself.

* Example: "The children built a castle out of sand."

* Adjective: It can describe something as being made of sand.

* Example: "They walked along the sand beach."

* Verb: While less common, it can act as a verb meaning to cover with sand.

* Example: "The wind sanded the car."

So, the part of speech of "sand" depends on its specific function in the sentence.