disappearing vs disappearance

disappearing and disappearance both are nouns.

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

As nouns, disappearing and disappearance are synonyms defined as:

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

disappearing (noun)	disappearance (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