honestness vs honest

honestness is a noun but honest is not a noun.

Word	Noun	Adjective	Verb	Adverb
honestness	Yes	No	No	No
honest	No	Yes	No	No

honestness (noun)	honest (noun)
the quality of being honest

honestness (adjective)	honest (adjective)
	not disposed to cheat or defraud; not deceptive or fraudulent; marked by truth
	gained or earned without cheating or stealing
	not forged
	without dissimulation; frank
	worthy of being depended on
	without pretensions