shampoo vs soap

shampoo

verb
  • To wash (i.e. the hair, carpet, etc.) with shampoo. 

  • To wash one's own hair with shampoo. 

  • To press or knead the whole surface of the body of (a person), and at the same time to stretch the limbs and joints, in connection with the hot bath. 

noun
  • Champagne. 

  • A traditional Indian and Persian body massage given after pouring warm water over the body and rubbing it with extracts from herbs. 

  • An instance of washing the hair or other fibres with shampoo. 

  • A commercial liquid soap product for washing hair or other fibres/fibers, such as carpets. 

soap

verb
  • To apply soap to in washing. 

  • To cover, lather or in any other form treat with soap, often as a prank. 

  • To be discreet about (a topic). 

noun
  • sodium pentothal 

  • A soap opera. 

  • Some other substance, often a detergent or another surfactant, able to mix with both oil and water, used for cleaning. 

  • A solid masonry unit or brick reduced in depth or height from standard dimensions. 

  • A metallic salt derived from a fatty acid, commonly used in cleaning products. 

  • Money, specially when used as a bribe. 

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