A noun is an object, the subject of a sentence. A noun creates the context of its sentence. A noun is not a name, a descriptor of itself, or an abstract term. Although the same words may be used for both purposes, the context is quite different. Nouns and names are also commonly used as verbs in American usage, which is theoretically bad grammar, but in terms of communication it's economic and functional in modern communications.
Examples of Noun:
|The cat is a tabby.|
Honesty is the best policy.
Reality is debatable, or isn't it?
You're going to dog this conversation with innuendo, aren't you?