dismissal vs firing

dismissal and firing both are nouns.

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

As nouns, dismissal and firing are synonyms defined as:

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

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

dismissal (noun)	firing (noun)
the termination of someone's employment (leaving them free to depart)	the act of setting something on fire
a judgment disposing of the matter without a trial	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
permission to go; the sending away of someone	the act of firing weapons or artillery at an enemy