The difference between Night hag and Nightmare
When used as nouns, night hag means a demon that gives rise to sleep paralysis, whereas nightmare means a female demon or monster, thought to plague people while they slept and cause a feeling of suffocation and terror during sleep.
check bellow for the other definitions of Night hag and Nightmare
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Night hag as a noun (folklore):
a demon that gives rise to sleep paralysis
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Nightmare as a noun (now, _, rare):
A female demon or monster, thought to plague people while they slept and cause a feeling of suffocation and terror during sleep.
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Nightmare as a noun:
A very bad or frightening dream.
Examples:
"I had a nightmare that I tried to run but could neither move nor breathe."
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Nightmare as a noun (figuratively):
Any bad, miserable, difficult or terrifying situation or experience that arouses anxiety, terror, agony or great displeasure.
Examples:
"Cleaning up after identity theft can be a nightmare of phone calls and letters."