annul vs annulment

annul is not a noun while annulment is a noun.

Word	Noun	Adjective	Verb	Adverb
annul	No	No	Yes	No
annulment	Yes	No	No	No

annul (noun)	annulment (noun)
	(law) a formal termination (of a relationship or a judicial proceeding etc)
	the act of abrogating; an official or legal cancellation
	the state of being cancelled or annulled

annul (verb)	annulment (verb)
cancel officially
declare invalid