forthrightness vs honesty

forthrightness and honesty both are nouns.

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

As nouns, honesty is a hypernym of forthrightness; that is, honesty is a word with a broader meaning than forthrightness:

forthrightness: the quality of being honest and straightforward in attitude and speech
honesty: the quality of being honest

Other hypernyms of forthrightness include honestness.

forthrightness (noun)	honesty (noun)
the quality of being honest and straightforward in attitude and speech	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