auxiliary vs leading

auxiliary

adj
  • Helping; giving assistance or support. 

  • Supplementary or subsidiary. 

  • Held in reserve for exceptional circumstances. 

  • Of a ship, having both sails and an engine. 

  • Relating to an auxiliary verb. 

noun
  • A person or group that acts in an auxiliary manner. 

  • An auxiliary verb. 

  • A marching band colorguard. 

  • A sailing vessel equipped with an engine. 

leading

adj
  • Providing guidance or direction. 

  • Occurring in advance; preceding. 

  • Ranking first. 

noun
  • Vertical space added between lines; line spacing. 

  • An act by which one is led or guided. 

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