marrow vs watermelon

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. 

watermelon

noun
  • A plant of the species Citrullus lanatus, bearing a melon-like fruit. 

  • A pinkish-red colour, like that of watermelon flesh (also called watermelon pink). 

  • A project that is presented as on schedule when it actually has parts that are falling behind. 

  • The fruit of the watermelon plant, having a green rind and watery flesh that is typically bright red when ripe and contains black pips. 

  • An environmentalist with socialist leanings. 

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