When discussing kinds of terms, there are certain kinds that come up often. Singular entities such as Queen Elizabeth II are one kind, categories such as cats are another, and properties such as blue are a third.
However, what about substances like "gold"? Is a gold watch an instance of the property of being gold, or being made of gold? Or does the watch simply contain trillions of elements in the category "gold (atoms)"? Or is "gold" a singular entity that exists scattered throughout the Universe? Or are substances an entire category to themselves?