brook vs countenance

brook and countenance both are nouns.

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

As verbs, countenance is a hypernym of brook; that is, countenance is a word with a broader meaning than brook:

Other hypernyms of brook include allow, let, permit.

brook (noun)	countenance (noun)
a natural stream of water smaller than a river (and often a tributary of a river)	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

brook (verb)	countenance (verb)
put up with something or somebody unpleasant	consent to, give permission; permit