firing vs dismission

firing and dismission both are nouns.

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

As nouns, firing and dismission are synonyms defined as:

firing and dismission: the termination of someone's employment (leaving them free to depart)

Other synonyms of firing include discharge, dismissal, liberation, release, sack, sacking.

firing (noun)	dismission (noun)
the act of setting something on fire	the termination of someone's employment (leaving them free to depart)
the termination of someone's employment (leaving them free to depart)	official notice that you have been fired from your job
the act of discharging a gun
the act of firing weapons or artillery at an enemy