Synonyms for Disappearance:

n.

extinction, wearing away, into thin air, exit, desertion, exodus, disintegration, dispersal, eclipse, into/out of thin air, going, dissipation, withdrawal, Vanishment, vanishing point, wane, ceasing to appear, evanescence, flight, retirement, disappearing act, recession from view, away, escape, ebbing away, removal, decline and fall. show, fade out. act (noun)
disappearing.
disappearance (noun)
dissolution, disappearing, fade, departure, evaporation, fading, hiding.
dispersion (noun)
dissipation.
vanishing (noun)
dissipation, wearing away, evaporation, dissolution, flight, wane, dispersal, removal, withdrawal, desertion, decline and fall, escape, exit, going, retirement, fading, eclipse, evanescence, disintegration, departure, disappearing act, exodus.

Other synonyms:

Vanishment, escape, disappearing act, extinction, fade out. away. dissipation
evanescence.
Other relevant words:
evanescence, decline and fall, eclipse, fade out, Vanishment, away, disappearing, wearing away, withdrawal, retirement, wane, departure, exodus, disappearing act, removal, disintegration, fade, exit, flight, desertion, show, going, extinction, dispersal, escape, dissipation.

Usage examples for disappearance

  1. His disappearance had given John his idea. – Trent's Last Case The Woman in Black by E.C. (Edmund Clerihew) Bentley
  2. He had his warning in the disappearance of his friend, and he had several days in which to get out of St. Petersburg, but he stood his ground. – A Rock in the Baltic by Robert Barr
  3. Why was it that I saw some strange mystery in my friend's disappearance – Lady Audley's Secret by Mary Elizabeth Braddon