Is there a noun derivative of deteriorate deteris deterioration is not it verb the act deteriorating you want word for stuff that deteriorating?

You're right, "deterioration" is the noun form of the verb "deteriorate". It refers to the process of becoming worse.

There isn't a single noun that directly describes the "stuff" that is deteriorating. You might need to use a more descriptive phrase depending on the context, such as:

* Deteriorating materials: This is a general term for any materials that are in a state of decline.

* Damaged goods: This implies that the "stuff" has already suffered some form of deterioration.

* Waste products: This refers to materials that are no longer useful and are undergoing a process of decay.

* Broken equipment: This is specific to machinery or tools that are no longer functioning properly.

The best word to use will depend on the specific situation you are describing.