gaffer vs numero uno

gaffer

noun
  • The leader of a group or team, such as a boss, foreman, coach, publican. 

  • A chief lighting technician for a motion-picture or television production. 

  • The baby in the house. 

  • A sailor. 

  • An old man. 

  • A glassblower. 

numero uno

noun
  • The most important of a group. 

  • Oneself, especially one’s own interests. 

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