The difference between Daydream and Nightmare
When used as nouns, daydream means a spontaneous and fanciful series of thoughts while awake not connected to immediate reality, 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.
Daydream is also verb with the meaning: to have such a series of thoughts.
check bellow for the other definitions of Daydream and Nightmare
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Daydream as a noun:
A spontaneous and fanciful series of thoughts while awake not connected to immediate reality.
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Daydream as a verb:
To have such a series of thoughts; to woolgather.
Examples:
"Stop daydreaming and get back to work!"
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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."