cucumber vs pepo

cucumber

noun
  • The edible fruit of this plant, having a green rind and crisp white flesh. 

  • A vine in the gourd family, Cucumis sativus. 

  • A person who is calm and self-possessed. 

pepo

noun
  • A plant producing such a fruit. 

  • A fruit of plants of the gourd family Cucurbitaceae, possessing a hard rind and producing many seeds in a single, central, pulpy chamber. 

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