innocency vs artlessness

innocency and artlessness both are nouns.

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

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

Other hypernyms of innocency include ingenuousness, innocence, naturalness.

innocency (noun)	artlessness (noun)
an innocent quality or thing or act	ingenuousness by virtue of being free from artful deceit
	the quality of innocent naivete