facial gesture vs frown

facial gesture and frown both are nouns.

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

As nouns, frown is a hyponym of facial gesture; that is, frown is a word with a more specific, narrower meaning than facial gesture:

Other hyponyms of facial gesture include emoticon, gape, face, grimace, scowl, grin, grinning, smile, smiling, laugh, snarl, straight face, wink, wince.

facial gesture (noun)	frown (noun)
a gesture executed with the facial muscles	a facial expression of dislike or displeasure

facial gesture (verb)	frown (verb)
	look angry or sullen, wrinkle one's forehead, as if to signal disapproval