Private (adjective), secret (noun). its not equal comparison.
privacy is set apart something from public
while secrecy is to keep something hidden
Thank you for you explanation.
Isn't secrecy still noun?
So the problem is converted into what the difference between not public and hidden is.
Thank you.
Privacy is one of the reasons behind Secret.
Trade Secret is also a reason.
For not public and hidden, I think that
in some instances,
not public means others cannot access or know the content of it,
and hidden means others cannot know the existence of it.