yawn vs gape

yawn and gape both are nouns.

Word	Noun	Adjective	Verb	Adverb
yawn	Yes	No	Yes	No
gape	Yes	No	Yes	No

As verbs, yawn and gape are synonyms defined as:

Other synonyms of yawn include yaw.

yawn (noun)	gape (noun)
an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom	a stare of amazement (usually with the mouth open)
	an expression of openmouthed astonishment

yawn (verb)	gape (verb)
utter a yawn, as from lack of oxygen or when one is tired	look with amazement; look stupidly
be wide open	be wide open