inactivation vs firing

inactivation and firing both are nouns.

Word	Noun	Adjective	Verb	Adverb
inactivation	Yes	No	No	No
firing	Yes	No	No	No

As nouns, firing is a hypernym of inactivation; that is, firing is a word with a broader meaning than inactivation:

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

Other hypernyms of inactivation include discharge, dismissal, dismission, liberation, release, sack, sacking.

inactivation (noun)	firing (noun)
breaking up a military unit (by transfers or discharges)	the act of setting something on fire
the process of rendering inactive	the termination of someone's employment (leaving them free to depart)
	the act of discharging a gun
	the act of firing weapons or artillery at an enemy