innocency vs ingenuousness

innocency and ingenuousness both are nouns.

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

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

Other hypernyms of innocency include artlessness, innocence, naturalness.

innocency (noun)	ingenuousness (noun)
an innocent quality or thing or act	openly straightforward or frank
	the quality of innocent naivete