deactivation vs dismissal

deactivation and dismissal both are nouns.

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

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

deactivation: breaking up a military unit (by transfers or discharges)
dismissal: the termination of someone's employment (leaving them free to depart)

Other hypernyms of deactivation include discharge, dismission, firing, liberation, release, sack, sacking.

deactivation (noun)	dismissal (noun)
the act of deactivating or making ineffective (as a bomb)	the termination of someone's employment (leaving them free to depart)
breaking up a military unit (by transfers or discharges)	a judgment disposing of the matter without a trial
	official notice that you have been fired from your job
	permission to go; the sending away of someone