26
dream(noun, concept, understanding, desire, fancy)
25
horror(noun, state, distress, anxiety, experience)
23
incubus(noun, fancy, spirit, experience, pain)
18
fear(noun, distress, anxiety, awful, terrible)
18
phantasm(noun, concept, understanding, desire, fancy)
12
vision(noun, concept, desire, fancy, spirit)
12
hobgoblin(noun, fear, ghost, devil)
12
suffering(noun, trouble, blow, distress, care)
11
illusion(noun, desire, fancy, spirit, experience)
10
hell(noun, place, difficulty, situation, trial)
10
fantasy(noun, understanding, desire, fancy, spirit)
10
abyss(noun, difficulty, torment, misery, trial)
9
terror(noun, distress, anxiety, awful, terrible)
9
torture(noun, trouble, torment, trial, suffering)
8
torment(noun, trouble, experience, vision, misery)
7
ordeal(noun, trouble, bother, blow, distress)
7
agony(noun, trouble, torment, misery, trial)
7
vampire(noun, ghost)
6
bugbear(noun, imagination, ghost)
6
trial(noun, trouble, experience, torment, vision)
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APASmart Define. (2016). nightmare thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/nightmare/thesaurus/synonyms
ChicagoSmart Define. 2016. "nightmare thesaurus" https://smartdefine.org/nightmare/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, nightmare thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/nightmare/thesaurus/synonyms>.
MLASmart Define. "nightmare thesaurus" 29 February 2016. Web. 20 September 2026. <https://smartdefine.org/nightmare/thesaurus/synonyms>