broccoli vs celery

broccoli

noun
  • A plant, Brassica oleracea var. italica, of the cabbage family, Brassicaceae; especially, the tree-shaped flower and stalk that are eaten as a vegetable. 

  • Marijuana. 

celery

noun
  • The stalks of this herb eaten as a vegetable. 

  • A European herb (Apium graveolens) of the carrot family. 

  • A yellow-green colour, like that of a celery. 

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