flump vs thud

flump

noun
  • The dull sound so produced. 

  • A type of large marshmallow. 

  • A fat out-of-shape person. 

verb
  • To move or fall heavily, or with a dull sound. 

  • To drop something heavily or with a dull sound. 

thud

noun
  • The sound of a dull impact. 

  • A slower, dull impact with a wide surface area. 

  • A hard, dull impact. 

verb
  • To make the sound of a dull impact. 

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