flump vs plonk

flump

verb
  • To drop something heavily or with a dull sound. 

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

noun
  • A type of large marshmallow. 

  • A fat out-of-shape person. 

  • The dull sound so produced. 

plonk

verb
  • To set or toss (something) down carelessly. 

  • To sit down heavily and without ceremony. 

  • To automatically ignore a particular poster. 

noun
  • Cheap or inferior everyday wine. 

  • AC Plonk 

  • A female police constable. 

  • The sound of something solid landing. 

adv
  • Precisely and forcefully. 

intj
  • The sound made by something solid landing. 

  • The supposed sound of adding a user to one's killfile. 

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