clunch vs potter's clay

clunch

noun
  • A traditional building material mostly made of chalk or clay. 

verb
  • To grasp firmly; clench. 

potter's clay

noun
  • The clay used by a potter. 

  • A person or people created and shaped by God. 

  • A nation or kingdom. 

How often have the words clunch and potter's clay occurred in a corpus of books? (source: Google Ngram Viewer )