revoke vs countermand

revoke and countermand both are nouns.

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

As verbs, revoke and countermand are synonyms defined as:

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

revoke (noun)	countermand (noun)
the mistake of not following suit when able to do so	a contrary command cancelling or reversing a previous command

revoke (verb)	countermand (verb)
cancel officially	cancel officially
fail to follow suit when able and required to do so