flump vs subside

flump

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

  • To drop something heavily or with a dull sound. 

noun
  • A type of large marshmallow. 

  • A fat out-of-shape person. 

  • The dull sound so produced. 

subside

verb
  • To fall downward; to become lower; to descend; to sink. 

  • To cease talking. 

  • To sink or fall to the bottom; to settle, as lees. 

  • To fall into a state of calm; to be calm again; to settle down; to become tranquil; to abate. 

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