international football vs pigskin

international football

noun

  • The combination of Canadian football and American football. 

  • Used other than figuratively or idiomatically: see international, football. 

  • Soccer. 

pigskin

noun

  • A football. 

  • Leather made from the skin of a pig. 

  • The skin of a pig. 

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