secrecy vs secretiveness

secrecy and secretiveness both are nouns.

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

As nouns, secrecy and secretiveness are synonyms defined as:

Other synonyms of secrecy include silence.

secrecy (noun)	secretiveness (noun)
the trait of keeping things secret	characterized by a lack of openness (especially about one's actions or purposes)
the condition of being concealed or hidden	the trait of keeping things secret