What word will replace an pronoun and a noun?

You're looking for a word that can replace both a pronoun and a noun. This sounds like you're describing a pronoun.

Here's why:

* Pronoun: A pronoun stands in for a noun (e.g., "he", "she", "it", "they").

* Noun: A noun is a word that names a person, place, thing, or idea.

Let me know if you had something else in mind!