facial expression vs aspect

facial expression and aspect both are nouns.

Word	Noun	Adjective	Verb	Adverb
facial expression	Yes	No	No	No
aspect	Yes	No	No	No

As nouns, facial expression and aspect are synonyms defined as:

Other synonyms of facial expression include expression, face, look.

facial expression (noun)	aspect (noun)
the feelings expressed on a person's face	the feelings expressed on a person's face
a gesture executed with the facial muscles	a characteristic to be considered
	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