Demon and Nightmare

Demon

Demon noun - An evil spirit.

Usage example: only in rare cases is the ancient rite of exorcism performed to cast out a troublesome demon

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Nightmare and demon are semantically related. In some cases you can use "Nightmare" instead a noun "Demon".

Nearby Words: demoniac, demonic, demonical, demonically, demoness

Nightmare noun - A situation or state that causes great suffering and unhappiness.

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Demon and nightmare are semantically related. Sometimes you can use "Demon" instead a noun "Nightmare".

Nearby Word: nightmarish

full	full demon	full nightmare
pure	pure demon	pure nightmare
complete	complete demon	complete nightmare
original	original demon	original nightmare
Other adjectives: true, single, nasty, actual, real, massive, little, horrible, murderous, titular, last, recurring, giant, eponymous.

Once a human serial killer, he turned into something resembling a nightmare ghost/demon after his death.

Source: Franchise / A Nightmare on Elm Street
An easier parallel is that Freddy is some sort of ghost or a demon (he is in service to nightmare demons after all).

Source: Franchise / A Nightmare on Elm Street
One being the catchy opening song and the other, the scary, nightmare indulging villain: a demon called Malmoth.

Source: Nightmare Fuel / Western Animation TV

Cite this Source

Nightmare and Demon. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/demon/nightmare

Demon & Nightmare. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/demon/nightmare>.

Nightmare or Demon. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/demon/nightmare.

Google Ngram Viewer shows how "demon" and "nightmare" have occurred on timeline