refusal vs repudiation

refusal

noun
  • The act of refusing. 

  • Depth or point at which well or borehole drilling cannot continue. 

repudiation

noun
  • The act of refusing to accept; the act of repudiating. 

  • The young man's repudiation of the church's doctrines caused a conflict with his religious parents. 

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