facial gesture vs snarl

facial gesture and snarl both are nouns.

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

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

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

facial gesture (noun)	snarl (noun)
a gesture executed with the facial muscles	something jumbled or confused
	a vicious angry growl
	an angry vicious expression

facial gesture (verb)	snarl (verb)
	make more complicated or confused through entanglements
	utter in an angry, sharp, or abrupt tone
	make a snarling noise or move with a snarling noise
	twist together or entwine into a confusing mass