herbivore vs vegan

herbivore

noun
  • An organism that feeds chiefly on plants; an animal that feeds on herbage or vegetation as the main part of its diet. 

vegan

noun
  • A person who does not eat, drink or otherwise consume any animal products 

  • A person committed to avoiding products and practices that inherently involve animal use, including all foods containing animal products, and to abstaining from direct and intentional harm to animals as far as possible; an adherent to veganism. 

adj
  • Relating to vegans or veganism. 

  • Committed to avoiding any product or practice that inherently involves animal use. 

  • Not containing animal products (meat, eggs, milk, leather, etc) or inherently involving animal use. 

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