restriction vs tabooing

restriction

noun
  • The act of restricting, or the state of being restricted. 

  • A regulation or limitation that restricts. 

  • The mechanism by which a cell degrades foreign DNA material. 

tabooing

noun
  • The imposition of a taboo. 

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