yawn vs yaw

yawn and yaw both are nouns.

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

As verbs, yawn and yaw are synonyms defined as:

Other synonyms of yawn include gape.

yawn (noun)	yaw (noun)
an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom	an erratic deflection from an intended course

yawn (verb)	yaw (verb)
utter a yawn, as from lack of oxygen or when one is tired	deviate erratically from a set course
be wide open	swerve off course momentarily
	be wide open