In some languages there's a categorical word for all things which are evil and imaginary. For example, Strašidlo in Czech describes ghosts, bogeymen, etc.
Is there an equivalent word in English?
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I would suggest "monster", "demon", or "bogeyman" depending on context
If you just want to talk about the general category that includes Dracula, Xenomorphs, zombies, and such, "monster" is probably the best fit.
If you want to put particular emphasis on the evil nature of these things, then "demon" may get the message across better. Note that demon can also refer to a specific kind of evil entity, so this probably shouldn't be used in a context where that confusion is likely.
If you want to emphasize that these things aren't real, use "bogeyman". Because the bogeyman originates as a nondescript way to frighten children into good behavior, it has developed a strong connotation of unreality in addition to being evil in some way.
Monsters is what we typically use for this in English. It covers any imaginary, "bad", or frightening creature.
"Creatures" also could work, but it doesn't always imply the creature is bad.
The word spectre comes to mind as a perfect equivalent. Spectre can be used to mean ghost in the traditional sense or can be extended to mean anything feared but not tangible. Karl Marx, for example, writes "There is a spectre haunting Europe, the spectre of communism"
I would say 'SPIRITS'. According to Merriam-Webster Dictionary: SPIRIT :an often malevolent being that is bodiless but can become visible. As some spirits may be kind, I must give the variant 'evil spirits' to better correspond the answer. There's one more term from Merriam-Webster Dictionary: incubus an evil spirit that lies on persons in their sleep. Though it is also the name of a particular evil spirit, not the hyperonym.