What term describes anything that occupies space and has mass?

The term that describes anything that occupies space and has mass is matter. Matter is a fundamental concept in chemistry and physics; it encompasses all substances that have physical presence, meaning they can be observed and measured. Matter includes a variety of states such as solids, liquids, gases, and plasma, and is essentially the "stuff" that makes up everything in the universe.

Volume refers specifically to the amount of space occupied by an object, while mass is a measure of the amount of matter within that object. Density, on the other hand, is a derived physical property that refers to the mass of an object divided by its volume. Thus, while mass, volume, and density are related concepts that describe certain aspects of matter, none of them fully encompass the definition of matter itself.