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Definition of phantasm : 1. A mental image or representation of a real object; a fancy; a notion.
2. An image formed by the mind, and supposed to be real or material; a shadowy or airy appearance; sometimes, an optical illusion; a phantom; a dream.

Synonyms:

vestige, darkness, bogey, shadower, spectre, figment, daydream, revenant, real, dark, mirage, error, shade, fiction, fantasm, reverie, hallucination, bogeyman, fancy, delusion, bogle, fallacy, visitant, spook, ignis fatuus, trace, wraith, tail, fantasy, tincture, supernatural, phantasma, eidolon, dream, haunt, vision

daemon, werewolf, apparition, bugbear, succubus, horror, monster, Frankenstein, shadow, ghoul, specter, chimera, illusion, Dracula, bogey man, myth, incubus, ogre, phantom, spirit, nightmare, ghost, terror, bugaboo, hobgoblin, vampire

Usage examples:

• Experience had bred no fancies in him that could raise the phantasm of appetite. - "Silas Marner The Weaver of Raveloe", George Eliot.
• The crisis came with the attack of the Leopard on the Chesapeake in 1807, after which the possibility of maintaining peace, under such a pressure, appeared, in its true light, as a phantasm. - "The Emancipation of Massachusetts", Brooks Adams.
• Vivid as it seems- all I suffer as I write is but a faint phantasm of what I then endured. - "Wilfrid Cumbermede", George MacDonald.