What part of speech is the word volunteer?

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

* Noun: A person who performs a service willingly and without pay.

* Example: "The volunteer helped out at the soup kitchen."

* Verb: To offer oneself for a service willingly and without pay.

* Example: "She volunteered to help with the cleanup."

Let me know if you want more examples or have any other questions!