palpitation vs thump

palpitation

noun
  • An abnormal beating of the heart that may be perceived by the patient, a result of excitement, exertion, or illness. 

thump

noun
  • The sound of such a blow; a thud. 

  • A blow that produces a muffled sound. 

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 palpitation and thump occurred in a corpus of books? (source: Google Ngram Viewer )