Although both terror and horror imply extreme fear or the presence of danger or evil, they have a slight difference in usage. Terror is typically used in anticipation of a danger that's in the future. This intense dread or panic is a reaction to something that could or is going to happen.

The Most Terrifying Form Of Horror

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HOME INVASION.
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MONSTERS. ...
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FOUND FOOTAGE. ...
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PARANORMAL. ...
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GORE. ...
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SLASHER. Likely the most popular genre listed, slashers are a classic when it comes to horror. ...
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psychological. Psychological horror relies on curating suspense and fear through one's psyche. ...