nubbin vs seed pit

nubbin

noun
  • A stub, especially a stub of undeveloped corn or fruit or nipple. 

  • A small protuberance, bud, bump, or knob. 

  • The clitoris. 

seed pit

noun
  • A single seed in the center of a cherry, peach, plum, olive, avocado or other fruit. 

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