jack-o'-lantern vs marrow

jack-o'-lantern

noun
  • A similar item made from a turnip 

  • A carved pumpkin whose top and stem have been cut out and interior removed, leaving a hollow shell that is then decorated to represent a face, illuminated from within by a candle. It is a symbol of Halloween. 

marrow

noun
  • A kind of vegetable like a large courgette/zucchini or squash. 

  • The inner meaning or purpose. 

  • The pith of certain plants. 

  • Bone marrow biopsy. 

  • The essence; the best part. 

  • The substance inside bones which produces blood cells. 

  • A friend, pal, buddy, mate. 

How often have the words jack-o'-lantern and marrow occurred in a corpus of books? (source: Google Ngram Viewer )