disappearing vs departure

disappearing and departure both are nouns.

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

As nouns, departure is a hypernym of disappearing; that is, departure is a word with a broader meaning than disappearing:

Other hypernyms of disappearing include going, going away, leaving.

disappearing (noun)	departure (noun)
the act of leaving secretly or without explanation	the act of departing
	euphemistic expressions for death
	a variation that deviates from the standard or norm