Epiphenomenalism refers to the belief that mental states and processes do not have a causal relationship with physical events in the body. There are a few synonyms of epiphenomenalism that can be used to express this concept with different choice of words, including: 1. Occasionalism - This term is used to describe the belief that there is no direct causal link between physical events and mental events, but rather, it is only a series of coincidences or random occurrences. 2. Dualism - This refers to the philosophical idea that the mind is separate from the body and is non-physical. 3. Mind-body duality - This is another term that refers to the distinction between the physical body and mental processes. 4. Non-reductive physicalism - This is a term that suggests mental events cannot be reduced to mere physical events.