furtiveness vs secretiveness

furtiveness and secretiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
furtiveness	Yes	No	No	No
secretiveness	Yes	No	No	No

As nouns, secretiveness is a hypernym of furtiveness; that is, secretiveness is a word with a broader meaning than furtiveness:

furtiveness: a disposition to be sly and stealthy and to do things surreptitiously
secretiveness: characterized by a lack of openness (especially about one's actions or purposes)

Other hypernyms of furtiveness include closeness.

furtiveness (noun)	secretiveness (noun)
a disposition to be sly and stealthy and to do things surreptitiously	characterized by a lack of openness (especially about one's actions or purposes)
	the trait of keeping things secret