honestness vs honesty

honestness and honesty both are nouns.

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

As nouns, honestness and honesty are synonyms defined as:

honestness (noun)	honesty (noun)
the quality of being honest	the quality of being honest
	southeastern European plant cultivated for its fragrant purplish flowers and round flat papery silver-white seedpods that are used for indoor decoration