facial gesture vs facial expression

facial gesture and facial expression both are nouns.

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

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

facial gesture and facial expression: a gesture executed with the facial muscles

facial gesture (noun)	facial expression (noun)
a gesture executed with the facial muscles	the feelings expressed on a person's face
	a gesture executed with the facial muscles