renege vs countermand

renege and countermand both are nouns.

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

As verbs, countermand is a hypernym of renege; that is, countermand is a word with a broader meaning than renege:

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

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

renege (verb)	countermand (verb)
fail to fulfill a promise or obligation	cancel officially