drenching vs lavage

drenching

noun
  • The act by which something is drenched; a soaking. 

  • The administering of a medicinal draught to an animal. 

lavage

noun
  • A washing. 

  • A washing of a hollow organ. 

verb
  • To wash a hollow organ 

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