opened vs yawning

opened is not a noun while yawning is a noun.

Word	Noun	Adjective	Verb	Adverb
opened	No	Yes	No	No
yawning	Yes	Yes	No	No

opened (noun)	yawning (noun)
	an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom

opened (adjective)	yawning (adjective)
used of mouth or eyes	showing lack of attention or boredom
made open or clear	gaping open as if threatening to engulf someone or something
not sealed or having been unsealed	with the mouth wide open indicating boredom or sleepiness