courgette vs medulla

courgette

noun
  • The edible fruit of this marrow/squash. 

  • A particular variety of Cucurbita pepo, a small marrow/squash. 

medulla

noun
  • The soft inner part of something, especially the pith of a fruit. 

  • The medulla oblongata. 

  • The internal tissue of a plant. 

  • The inner substance of various organs and structures, especially the marrow of bones. 

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