sacking vs dismission

sacking and dismission both are nouns.

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

As nouns, sacking and dismission are synonyms defined as:

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

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

sacking (noun)	dismission (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	official notice that you have been fired from your job