drench vs lavage

drench

noun
  • A draught administered to an animal. 

verb
  • To soak, to make very wet. 

  • To cause to drink; especially, to dose (e.g. a horse) with medicine by force. 

lavage

noun
  • A washing of a hollow organ. 

  • A washing. 

verb
  • To wash a hollow organ 

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