nihil obstat vs prohibition

nihil obstat

noun
  • A declaration of no objection; (specifically) a declaration used by the Catholic Church to indicate a book, initiative, or appointment to an office has been found to not breach religious or moral norms. 

prohibition

noun
  • A law prohibiting the manufacture or sale of alcohol. 

  • A period of time when specific socially disapproved consumables are considered controlled substances. 

  • An act of prohibiting, forbidding, disallowing, or proscribing something. 

How often have the words nihil obstat and prohibition occurred in a corpus of books? (source: Google Ngram Viewer )