Synonyms for fantasy

noun

1. Whimsical imagination

   reverie, daydream, flight of fancy, escape; see fancy 2.

2. Whimsical or fantastic creation

   vision, phantasm, invention, illusion, air castle, extravaganza, castle in Spain, flight, figment, fiction, romance, conceit, chimera, mirage, apparition, will-o'-the-wisp, ignis fatuus (Latin), bugbear, nightmare, hallucination, fantasia, science fiction, utopia, Atlantis, fairyland, daydream, pipe dream*.