art union vs competition

art union

noun
  • A raffle run to raise money for a charity. 

  • An organisation formed for the purpose of educating the general public about art and supporting artists. 

competition

noun
  • A contest for a prize or award. 

  • The action of competing. 

  • The competitors in such a contest. 

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