The term thnetopsychism, which refers to the belief that the soul is mortal and dies with the body, has several synonyms. One synonym is mortalism, which suggests that human beings have no immortal soul and that death is the end of all consciousness. Another synonym is materialism, which focuses on the belief that all reality can be reduced to matter and physical processes. Additionally, some people use the term psychophysical monism to refer to the idea that mind and body are not separate entities but rather different aspects of the same thing. Lastly, existentialism is sometimes used to describe the belief that life has no inherent meaning or purpose, and that individuals must create their own sense of purpose in an absurd, meaningless world.