expunging vs extinguishment

expunging

noun
  • The act by which something is expunged; a deletion. 

extinguishment

noun
  • The act of extinguishing, putting out, or quenching, or the state of being extinguished. 

  • The annihilation or extinction of a right or obligation. 

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