dehydration vs drenching

dehydration

noun
  • The act or process of removing water from something. 

  • The condition in which water in the body drops below normal levels, usually caused by illness, sweating or by not drinking enough. 

drenching

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

  • The administering of a medicinal draught to an animal. 

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