candidness vs forthrightness

candidness and forthrightness both are nouns.

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

As nouns, candidness and forthrightness are synonyms defined as:

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

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

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