besmirchment vs onus

besmirchment

noun

  • The act of sullying or besmirching. 

onus

noun

  • Stigma. 

  • A legal obligation. 

  • Burden of proof, onus probandi. 

  • Blame. 

  • Responsibility; burden. 

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