plop vs thump

plop

noun
  • A sound or action like liquid hitting a hard surface, or an object falling into a body of water. 

  • Excrement. 

verb
  • To make the sound of an object dropping into a body of liquid. 

  • To defecate. 

  • To land heavily or loosely. 

intj
  • Indicating the sound of something plopping. 

thump

noun
  • A blow that produces a muffled sound. 

  • The sound of such a blow; a thud. 

verb
  • To throb with a muffled rhythmic sound. 

  • To hit (someone or something) as if to make a thump. 

  • To cause to make a thumping sound. 

  • To thud or pound. 

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