privacy vs hiddenness

privacy and hiddenness both are nouns.

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

As nouns, hiddenness is a hyponym of privacy; that is, hiddenness is a word with a more specific, narrower meaning than privacy:

Other hyponyms of privacy include covertness, bosom, confidentiality, hiding.

privacy (noun)	hiddenness (noun)
the quality of being secluded from the presence or view of others	the state of being covert and hidden
the condition of being concealed or hidden