hiddenness vs secrecy

hiddenness and secrecy both are nouns.

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

As nouns, secrecy is a hypernym of hiddenness; that is, secrecy is a word with a broader meaning than hiddenness:

Other hypernyms of hiddenness include concealment, privacy, privateness.

hiddenness (noun)	secrecy (noun)
the state of being covert and hidden	the trait of keeping things secret
	the condition of being concealed or hidden