Reality is what we call “real life.” Everything, from time, to the Earth, to science, to concepts, to society, everything. Everything we see as real life is Reality.
Space is merely a component of reality. It is what we live in, the mathematical principle of our 3 dimensions. There is height, length, and depth, all of which construct what we see as space. If you walk 5 meters towards an object, the space between you and the object has been occupied by you, but inversely, the space where you once were is now unoccupied by you.
Space is merely a “cog” that helps create the overall “machine,” the machine being reality.