Here's why:
* Noun: A noun is a word that names a person, place, thing, or idea. "Community" names a group of people living in the same place or sharing a common interest.
* Common Noun: A common noun is a general name for a person, place, thing, or idea. "Community" is a common noun because it's not the specific name of any particular group.
* Pronoun: A pronoun is a word that replaces a noun or noun phrase. "Community" does not replace a noun, so it is not a pronoun.