champion vs proselytize

champion

verb
  • To promote, advocate, or act as a champion for (a cause, etc.). 

noun
  • Someone who fights for a cause or status. 

  • An ongoing winner in a game or contest. 

  • Someone who fights on another's behalf. 

  • A particularly notable member of a plant species, such as one of great size. 

  • Someone who is chosen to represent a group of people in a contest. 

adj
  • Acting as a champion; having defeated all one's competitors. 

  • Excellent; brilliant; superb; deserving of high praise. 

  • Excellent; beyond compare. 

proselytize

verb
  • To advertise a non-religious belief, way of living, cause, point of view, (scientific) hypothesis, social or other position, political party, or other organization; to convince someone to join such a cause or organization or support such a position; to recruit someone. 

  • To advertise one’s religious beliefs; to convert (someone) to one’s own faith or religious movement or encourage them to do so. 

  • To coerce into religious conversion. 

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