metaphysical materialism
Metaphysical materialism is the metaphysical world view that reality is defined by matter, and the immaterial does not exist. This is similar to metaphysical naturalism, however naturalism is the idea that the universe only runs on natural laws, and materialism is the idea that the universe is only matter, so materialism as a metaphysical concept is an ontological view of the universe, while naturalism is a scientific philosophy that takes the premise of materialism and applies it to our understanding of the universe.
Metaphysical materialism is just a fancier way of saying materialism, both mean the same thing obviously. Most people just use materialism, but adding the term metaphysical to it clarifies that it is talking about a material world of the universe and not an obsession with wealth.