lather vs shampooing

lather

noun
  • The foam made by rapidly stirring soap and water. 

  • A state of agitation. 

  • Foam from profuse sweating, as of a horse. 

verb
  • To form lather or froth, as a horse does when profusely sweating. 

  • To cover with lather. 

  • To beat or whip. 

shampooing

noun
  • The act of cleaning something with shampoo. 

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