outlawed vs taboo

outlawed

adj
  • put beyond the limits of the law, forbidden, against the law. 

  • put beyond the limits of the law, declared an outlaw or declared a criminal. 

taboo

adj
  • Culturally forbidden. 

  • Excluded or forbidden from use, approach or mention. 

noun
  • An inhibition or ban that results from social custom or emotional aversion. 

  • Something which may not be used, approached or mentioned because it is sacred. 

verb
  • To ban. 

  • To avoid. 

  • To mark as taboo. 

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