anklet vs pearl necklace

anklet

noun
  • A piece of jewelry/jewellery, resembling a bracelet but worn around the ankle. 

  • An ankle sock. 

pearl necklace

noun
  • Used other than figuratively or idiomatically: see pearl, necklace. 

  • A sexual act whereby semen is ejaculated onto a partner's upper chest, breasts and/or throat. 

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