The opposite of waste matter would be a valuable or useful matter. It refers to something that is essential or important and has a purpose. It is the opposite of waste matter that is considered useless, unwanted, and non-essential. Some examples of valuable matter are resources like water, energy, minerals, and food. Valuable matter also includes substances that can be recycled or repurposed, such as paper, plastic, and metal. These materials can be used to create new products, reducing the amount of waste produced. By identifying and utilizing valuable matter, we can create a more sustainable and productive environment.