different between sacking vs dismissal

English

sacking (countable and uncountable, plural sackings)

(uncountable) Cheap rough cloth such as would be used to make bags (sacks).
The farmer grabbed a handful of sacking and rubbed down the cow.
(countable) Firing or termination of an employee.
He followed his sacking with a good drink.

sacking

From dismiss +? -al. A nineteenth-century coinage (modelled on committal etc.), replacing the regular form dismission.

dismissal (countable and uncountable, plural dismissals)

The act of sending someone away.
Deprivation of office; the fact or process of being fired from employment or stripped of rank.
A written or spoken statement of such an act.
Release from confinement; liberation.
Removal from consideration; putting something out of one's mind, mentally disregarding something or someone.
(law) The rejection of a legal proceeding, or a claim or charge made therein.
(cricket) The event of a batsman getting out; a wicket.
(Christianity) The final blessing said by a priest or minister at the end of a religious service

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