What is another word for flight of fancy?
Pronunciation: [flˈa͡ɪt ɒv fˈansi] (IPA) 
Flight of fancy is a phrase that describes an idea or thought that is unlikely to happen or a daydream. Synonyms for this phrase include whimsy, fancy, dream, illusion, delusion, figment, mirage, hallucination, and fantasy. Whimsy and fancy refer to ideas that are playful or imaginative, whereas illusion, delusion, and mirage involve ideas that are misleading or deceptive. A hallucination is a perception without physical sensation, while a figment describes something that is imagined but has no basis in reality. Lastly, fantasy implies a creative idea that is based on imagination and may or may not be possible. All of these synonyms can be used to describe a person or idea that is overly imaginative or unrealistic.
