disappearance vs disappearing

disappearance and disappearing both are nouns.

Word	Noun	Adjective	Verb	Adverb
disappearance	Yes	No	No	No
disappearing	Yes	No	No	No

As nouns, disappearance and disappearing are synonyms defined as:

disappearance and disappearing: the act of leaving secretly or without explanation

disappearance (noun)	disappearing (noun)
the act of leaving secretly or without explanation	the act of leaving secretly or without explanation
gradually ceasing to be visible
the event of passing out of sight
ceasing to exist