Here's why:
* Nouns are words that name people, places, things, or ideas.
* Pronouns act as substitutes for nouns, avoiding repetition and making sentences more concise.
Example:
* Original sentence: John went to the store and bought John a loaf of bread.
* Revised sentence: John went to the store and bought himself a loaf of bread.
In this example, the pronoun "himself" replaces the noun "John," making the sentence clearer and less repetitive.