disappear vs disappearance

disappear is not a noun while disappearance is a noun.

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

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

disappear (verb)	disappearance (verb)
get lost, as without warning or explanation
cease to exist
become less intense and fade away gradually
become invisible or unnoticeable