clunk vs crump

clunk

verb
  • to make such a sound 

noun
  • A dull, metallic sound, especially one made by two bodies coming into contact. 

crump

verb
  • To produce such a sound. 

  • (of one's health) to decline rapidly (but not as rapidly as crash). 

adj
  • Hard or crusty; dry baked 

noun
  • The sound of a muffled explosion. 

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