"how it got out is a mystery"; "it remains one of nature's secrets" information known only to a special group; "the secret of Cajun cooking" something that should remain hidden from others (especially information that is not to be passed on); "the combination to the safe was a secret...
mystery nails naked named namely names namespace namibia nancy naples narrative narrow nascar nasdaq nashville nasty nathan nation national nationally nations nationwide native natural naturally naturals nature naughty naval navigate navigation navigator nearby nearest nearly nebraska necessarily necessary necessity...