countenance vs aspect

countenance and aspect both are nouns.

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

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

Other hyponyms of countenance include expression, face, facial expression, look, poker face, devilishness.

countenance (noun)	aspect (noun)
the appearance conveyed by a person's face	the feelings expressed on a person's face
the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British)	a characteristic to be considered
formal and explicit approval	a distinct feature or element in a problem
	the visual percept of a region
	the beginning or duration or completion or repetition of the action of a verb

countenance (verb)	aspect (verb)
consent to, give permission; permit