ingenuousness vs candour

ingenuousness and candour both are nouns.

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

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

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

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

ingenuousness (noun)	candour (noun)
openly straightforward or frank	the quality of being honest and straightforward in attitude and speech
the quality of innocent naivete	ability to make judgments free from discrimination or dishonesty