ingenuousness vs forthrightness

ingenuousness and forthrightness both are nouns.

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

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

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

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

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