jack-o'-lantern vs pumpkin

jack-o'-lantern

noun
  • 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. 

  • A similar item made from a turnip 

pumpkin

noun
  • The color of the fruit of the pumpkin plant. 

  • Any of a number of cultivars from the genus Cucurbita; known in the US as winter squash. 

  • A domesticated plant, in species Cucurbita pepo, similar in growth pattern, foliage, flower, and fruit to the squash or melon. 

  • A term of endearment for someone small and cute. 

  • The round yellow or orange fruit of this plant. 

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