expurgation vs wudu

expurgation

noun
  • The act of expurgating, purging, or cleansing; purification from anything noxious, offensive, sinful, or erroneous. 

wudu

noun
  • the state of purity that is achieved by this washing 

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