Contractions are words formed by combining two words, often by omitting one or more letters and using an apostrophe. Examples include:
* don't (do not)
* can't (cannot)
* it's (it is)
Nouns are words that name people, places, things, or ideas.
Therefore, there is no such thing as a contraction noun.
It's possible that you may have heard or read this term in an incorrect context. Perhaps you're thinking of a specific type of noun that is often used with contractions? If you can provide more context, I might be able to help you understand what you're looking for.