deactivation vs ending

deactivation and ending both are nouns.

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

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

Other hypernyms of deactivation include conclusion, termination.

deactivation (noun)	ending (noun)
the act of deactivating or making ineffective (as a bomb)	the act of ending something
breaking up a military unit (by transfers or discharges)	the end of a word (a suffix or inflectional ending or final morpheme)
	the last section of a communication
	event whose occurrence ends something
	the point in time at which something ends