sacking vs dismissal

sacking and dismissal both are nouns.

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

As nouns, sacking and dismissal are synonyms defined as:

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

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

sacking (noun)	dismissal (noun)
the termination of someone's employment (leaving them free to depart)	the termination of someone's employment (leaving them free to depart)
coarse fabric used for bags or sacks	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