What source would you use to find out the part of speech word pseudonym?

You can find out the part of speech of the word "pseudonym" by using a dictionary.

Here are some examples of dictionaries you can use:

* Online dictionaries: Merriam-Webster, Oxford English Dictionary, Dictionary.com

* Printed dictionaries: Any standard dictionary will have the information you need.

When you look up "pseudonym" in a dictionary, you will likely find that it is classified as a noun.

Here's why:

* It names a person, place, or thing: A pseudonym is a false name used by an author or other person.

* It can be the subject of a sentence: "The author wrote under a pseudonym."

Let me know if you have any other words you want to look up!