ingenuousness vs candidness

ingenuousness and candidness both are nouns.

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

As nouns, candidness is a hypernym of ingenuousness; that is, candidness is a word with a broader meaning than ingenuousness:

ingenuousness: openly straightforward or frank
candidness: the quality of being honest and straightforward in attitude and speech

Other hypernyms of ingenuousness include candor, candour, directness, forthrightness, frankness.

ingenuousness (noun)	candidness (noun)
openly straightforward or frank	the quality of being honest and straightforward in attitude and speech
the quality of innocent naivete