Here's why:
* Nouns are words that name people, places, things, or ideas. They are essential for building sentences and expressing meaning.
* Conjunctions are words that join parts of a sentence together. They don't have their own meaning in the way that nouns do.
Here's an example:
* Sentence: "The cat and the dog played in the garden."
* Noun: "cat", "dog", "garden"
* Conjunction: "and"
In this sentence, "and" connects the noun phrases "the cat" and "the dog". It doesn't replace them.
Think of conjunctions as glue that holds different parts of a sentence together.