A person who believes in demons, studies demons, or practices demonism as a philosophy or religion.
From demon + -ist (one who practices or believes in). The -ist suffix indicates a follower or practitioner of a particular belief system or field of study, creating a parallel to terms like 'atheist' or 'pianist'.
A demonist isn't necessarily evil—many were medieval scholars and theologians who studied demons as part of legitimate intellectual inquiry, much like how modern scientists study any phenomenon without necessarily endorsing it.
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