Nouns

(n)disappearance, disappearingthe act of leaving secretly or without explanation
(n)disappearancethe event of passing out of sight
(n)fade, disappearancegradually ceasing to be visible
(n)disappearanceceasing to exist“he regretted the disappearance of Greek from school curricula”, “what was responsible for the disappearance of the rainforest?”, “the disappearance of resistance at very low temperatures”