exert vs shun

exert

verb
  • To put in vigorous action. 

  • To make use of, to apply, especially of something non-material. 

shun

verb
  • To shove, push. 

  • To screen, hide. 

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

  • To avoid, especially persistently; ostracize. 

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