disappearance vs ending

disappearance and ending both are nouns.

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

As nouns, ending is a hypernym of disappearance; that is, ending is a word with a broader meaning than disappearance:

Other hypernyms of disappearance include conclusion, termination.

disappearance (noun)	ending (noun)
the act of leaving secretly or without explanation	the act of ending something
gradually ceasing to be visible	the end of a word (a suffix or inflectional ending or final morpheme)
the event of passing out of sight	the last section of a communication
ceasing to exist	event whose occurrence ends something
	the point in time at which something ends