authority vs pro

authority

noun
  • A reliable, definitive source of information on a subject. 

  • Persons, regarded collectively, who occupy official positions of power; police or law enforcement. 

  • Official permission; authorisation to act in some capacity on behalf of a ruling entity. 

  • A government-owned agency that runs a revenue-generating activity for public benefit. 

  • Status as a trustworthy source of information, reputation for mastery or expertise; or claim to such status or reputation. 

  • Power or right to make or enforce rules or give orders; or a position having such power or right. 

pro

noun
  • Professional. 

  • A prostitute. 

  • A professional sportsman. 

  • A chemical prophylaxis taken after sex to avoid contracting venereal disease. 

  • A person who supports a concept or principle. 

  • An advantage of something, especially when contrasted with its disadvantages (cons). 

adj
  • Professional. 

prep
  • In favor of. 

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