inattentive vs yawning

inattentive is not a noun while yawning is a noun.

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

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

inattentive (adjective)	yawning (adjective)
showing a lack of attention or care	showing lack of attention or boredom
not showing due care or attention	gaping open as if threatening to engulf someone or something
	with the mouth wide open indicating boredom or sleepiness