annul vs vacate

annul and vacate both are verbs.

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

As verbs, annul and vacate are synonyms defined as:

Other synonyms of annul include countermand, lift, overturn, repeal, rescind, reverse, revoke.

annul (verb)	vacate (verb)
cancel officially	cancel officially
declare invalid	leave behind empty; move out of
	leave (a job, post, or position) voluntarily