facial gesture vs gape

facial gesture and gape both are nouns.

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

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

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

facial gesture (noun)	gape (noun)
a gesture executed with the facial muscles	a stare of amazement (usually with the mouth open)
	an expression of openmouthed astonishment

facial gesture (verb)	gape (verb)
	look with amazement; look stupidly
	be wide open