Here's how it works:
* New is an adjective describing something that is recently made, created, or acquired.
* Newness is the state or quality of being new. It's the abstract concept of freshness, novelty, or innovation.
For example:
* "I bought a new car." (New is an adjective modifying car)
* "The newness of the paint job was striking." (Newness is an abstract noun describing the quality of the paint)