something which one seems to see or experience during sleep

illusion, vision

wild or extravagant creative thought or mental pictures

imagination, dream

the unpleasant feeling caused by the nearness or possibility of danger or evil

alarm, apprehension

something invented or imagined

creation in one's mind

(in some religions) a place of punishment after death; a place, condition, of great suffering or misery

place of the condemned; bad situation

any severe or painful test of character or endurance

trouble, suffering

a ghost

ghost; figment of the imagination