What part of speech is substitute?

"Substitute" can be a few different parts of speech depending on its function in a sentence:

* Noun: A person or thing that takes the place of another.

* Example: "He's a good substitute for the injured player."

* Verb: To put something or someone in place of another.

* Example: "I substitute butter for margarine in this recipe."

* Adjective: Acting as a replacement.

* Example: "He's a substitute teacher for the class."

Let me know if you want examples of how to use "substitute" in a sentence with each part of speech.