consent vs countenance

consent and countenance both are nouns.

Word	Noun	Adjective	Verb	Adverb
consent	Yes	No	Yes	No
countenance	Yes	No	Yes	No

As verbs, countenance is a hyponym of consent; that is, countenance is a word with a more specific, narrower meaning than consent:

consent (noun)	countenance (noun)
permission for something to happen	the appearance conveyed by a person's face
	the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British)
	formal and explicit approval

consent (verb)	countenance (verb)
give an affirmative reply to; respond favorably to	consent to, give permission; permit