lather vs spank

lather

verb
  • To beat or whip. 

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

  • To cover with lather. 

noun
  • A state of agitation. 

  • The foam made by rapidly stirring soap and water. 

  • Foam from profuse sweating, as of a horse. 

spank

verb
  • To hit very hard. 

  • To move rapidly. 

  • To beat, smack or slap a person's buttocks, with the bare hand or other object, as punishment, gesture, or form of sexual interaction. 

  • To soundly defeat, to trounce. 

noun
  • A slapping sound, as produced by spanking. 

  • An instance of spanking, separately or part of a multiple blows-beating; a smack, swat, or slap. 

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