rescind vs countermand

rescind is not a noun while countermand is a noun.

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

As verbs, rescind and countermand are synonyms defined as:

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

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

rescind (verb)	countermand (verb)
cancel officially	cancel officially