vacate vs countermand

vacate is not a noun while countermand is a noun.

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

As verbs, vacate and countermand are synonyms defined as:

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

vacate (noun)	countermand (noun)
	a contrary command cancelling or reversing a previous command

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