cavern vs squish mitten

cavern

verb

  • To put into a cavern. 

  • To form a cavern or deep depression in. 

noun

  • A large, dark place or space. 

  • A large cave. 

  • An underground chamber. 

squish mitten

noun

  • vagina 

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