Pantheism is the belief that “God” is synonymous with the Universe. All of what is, and the forces and energies make up or ARE the Theos. God is not considered to be a being, or separate from creation.
In Panentheism, God is both synonymous with the universe, and has a transcendent aspect, an aspect or existence beyond that of the universe. God suffuses the universe, but also extend beyond it. It may or may not have a “being” aspect to it.