Hallucination (noun) — الهلوسة: Seeing or hearing something that is not really there. Below are 8 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
A false idea or a misleading appearance.
a false belief or opinion that is held despite evidence to the contrary; a mental state characterized by holding fixed false beliefs; an erroneous perception…
An optical illusion of water in a desert; something that is not real.
The ability to see; a plan for the future.
Imagination unrestrained by reality; a story set in an imagined world.
apparitionfalse perceptionphantasm