phantasmagory means phantasmagoria. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Why “phantasmagory” is a great word
PHANTASMAGORY — [Noun] A shifting series or succession of phantasms, illusions, or deceptive appearances. From French phantasmagorie, from Ancient Greek φάντασμα (phántasma, "apparition, phantom") + ἀγορεύω (agoreúō, "to speak publicly, harangue"). The earliest known use in English is from 1818, in the writing of S. Woodworth. Unlike "phantasm," a single, static spectre, or "phantasmagoria," its more common and spectacular cousin, phantasmagory is the restless, deceptive procession of one false image after another. It is the flicker of shadows cast by a magic lantern on smoke, the relentless and nonsensical logic of a fever dream, or the uncanny parade of faces conjured by memory just before sleep—a theater where every scene is an exit, and the only constant is the act of vanishing.
Etymology
From French phantasmagorie, from Ancient Greek φάντασμα (phántasma, “ghost”) + ἀγορεύω (agoreúō, “to speak publicly”).