nullify vs annul

nullify and annul both are verbs.

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

As verbs, nullify and annul are synonyms defined as:

Other synonyms of nullify include avoid, invalidate, quash, void.

nullify (verb)	annul (verb)
make ineffective by counterbalancing the effect of	cancel officially
show to be invalid	declare invalid
declare invalid