dismiss vs dismissal

dismiss is not a noun while dismissal is a noun.

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

dismiss (noun)	dismissal (noun)
	the termination of someone's employment (leaving them free to depart)
	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

dismiss (verb)	dismissal (verb)
declare void
bar from attention or consideration
end one's encounter with somebody by causing or permitting the person to leave
cease to consider; put out of judicial consideration
terminate the employment of; discharge from an office or position
stop associating with