invalidation vs annulment

invalidation and annulment both are nouns.

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

As nouns, invalidation and annulment are synonyms defined as:

invalidation and annulment: (law) a formal termination (of a relationship or a judicial proceeding etc)

invalidation (noun)	annulment (noun)
(law) a formal termination (of a relationship or a judicial proceeding etc)	(law) a formal termination (of a relationship or a judicial proceeding etc)
when a person's thoughts and feelings are rejected, ignored, or judged.	the act of abrogating; an official or legal cancellation
	the state of being cancelled or annulled