Here's why:
* Noun: A noun names a person, place, thing, or idea. "Conversation" refers to the act of talking back and forth.
Let's break down the other parts of speech:
* Verb: A verb expresses an action or state of being. Examples: *talk*, *speak*, *communicate*.
* Pronoun: A pronoun replaces a noun or noun phrase. Examples: *he*, *she*, *it*, *they*.
Let me know if you have more questions about grammar!