dismiss vs sack

dismiss is not a noun while sack is a noun.

Word	Noun	Adjective	Verb	Adverb
dismiss	No	No	Yes	No
sack	Yes	No	Yes	No

As verbs, dismiss and sack are synonyms defined as:

dismiss and sack: terminate the employment of; discharge from an office or position

Other synonyms of dismiss include can, displace, fire, force out, give notice, give the axe, give the sack, send away, terminate.

As verbs, sack is a hypernym of dismiss; that is, sack is a word with a broader meaning than dismiss:

dismiss (noun)	sack (noun)
	the termination of someone's employment (leaving them free to depart)
	the plundering of a place by an army or mob; usually involves destruction and slaughter
	a bag made of paper or plastic for holding customer's purchases
	a loose-fitting dress hanging straight from the shoulders without a waist
	a hanging bed of canvas or rope netting (usually suspended between two trees); swings easily
	a woman's full loose hiplength jacket
	any of various light dry strong white wine from Spain and Canary Islands (including sherry)
	the quantity contained in a sack
	an enclosed space

dismiss (verb)	sack (verb)
declare void	put in a sack
bar from attention or consideration	plunder (a town) after capture
end one's encounter with somebody by causing or permitting the person to leave	make as a net profit
cease to consider; put out of judicial consideration	terminate the employment of; discharge from an office or position
terminate the employment of; discharge from an office or position
stop associating with