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If you look at horror in the movies, a lot of the more frightening stuff  is achieved with lighting, shadows, sound and occasionally the MacGuffin. Whereas when you are writing a horror story or novel, you must rely on words that have texture and carry feelings. Another thing that horror writers need to remember is there is a difference between something being gross and something frightening.  Road kill is gross but not necessarily frightening.  A story about road kill that comes back to stalk the person that turned the animal into road kill might be frightening.