enroll vs shun

enroll

verb
  • To enlist oneself (in something) or become a member (of something) 

  • To enter (a name, etc.) in a register, roll or list 

  • To enlist (someone) or make (someone) a member of 

shun

verb
  • To screen, hide. 

  • To escape (a threatening evil, an unwelcome task etc). 

  • To avoid, especially persistently; ostracize. 

  • To shove, push. 

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