abrogation vs annulment

abrogation and annulment both are nouns.

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

As nouns, abrogation and annulment are synonyms defined as:

abrogation and annulment: the act of abrogating; an official or legal cancellation

Other synonyms of abrogation include repeal.

abrogation (noun)	annulment (noun)
the act of abrogating; an official or legal cancellation	(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