Figment

(n.) An invention; a fiction; something feigned or imagined.

Thesaurus Entries

apparition, brainchild, bubble, canard, chimera, concoction, creation, daydream, delirium, dream, eidolon, extravaganza, fable, fabrication, fancy, fantasque, fantasy, fiction, forgery, hallucination, idle fancy, illusion, imagery, imagination, imagining, insubstantial image, invention, maggot, make-believe, myth, nightmare, phantasm, phantom, romance, sick fancy, thick-coming fancies, trip, vapor, vision, whim, whimsy, wildest dreams