lather vs soap

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. 

soap

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

  • sodium pentothal 

  • A soap opera. 

  • 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. 

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

  • To apply soap to in washing. 

  • To be discreet about (a topic). 

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