candidness vs frankness

candidness and frankness both are nouns.

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

As nouns, candidness and frankness are synonyms defined as:

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

Other synonyms of candidness include candor, candour, directness, forthrightness.

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