earspool vs flesh tunnel

earspool

noun
  • A short cylindrical piece of jewellery traditionally worn in an ear piercing. 

flesh tunnel

noun
  • A short, hollow, cylindrical piece of jewellery worn in such a piercing. 

  • A piercing in the earlobe which has been deliberately stretched to achieve a larger gauge. 

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