expunge vs ixnay

expunge

verb
  • To erase or strike out. 

  • To eliminate completely; to annihilate. 

  • To delete permanently (e-mail etc.) that was previously marked for deletion but still stored. 

ixnay

verb
  • To reject something. 

noun
  • Nothing; nix; often in the phrase "ixnay on ...", indicating something that must not be mentioned, often in Pig Latin 

intj
  • No. 

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