shirk vs shun

shirk

verb
  • To evade an obligation; to avoid the performance of duty, as by running away. 

  • To avoid, especially a duty, responsibility, etc.; to stay away from. 

  • To procure by petty fraud and trickery; to obtain by mean solicitation. 

noun
  • One who shirks, who avoids a duty or responsibility. 

  • The unforgivable sin of idolatry. 

shun

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

  • To screen, hide. 

  • To avoid, especially persistently; ostracize. 

  • To shove, push. 

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