Here's why:
* Noun: A noun is a word that names a person, place, thing, or idea. "Noun" itself is a word that names a part of speech.
* Pronoun: A pronoun is a word that replaces a noun. Examples: he, she, it, they, we, you, I.
* Verb: A verb is a word that describes an action or a state of being. Examples: run, jump, think, be, seem.