frankness vs honestness

frankness and honestness both are nouns.

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

As nouns, honestness is a hypernym of frankness; that is, honestness is a word with a broader meaning than frankness:

frankness: the quality of being honest and straightforward in attitude and speech
honestness: the quality of being honest

Other hypernyms of frankness include honesty.

frankness (noun)	honestness (noun)
the quality of being honest and straightforward in attitude and speech	the quality of being honest
the trait of being blunt and outspoken