Zea mays everta vs popcorn

Zea mays everta

popcorn

verb
  • To stand or jump up quickly. 

noun
  • A kind of stitch similar to a bobble. 

  • A snack food made from corn/maize kernels popped by dry heating. 

  • A type of maize with a hard outer hull that, along with the type of starch it contains, makes it suitable for popping. 

  • Entertainment. 

How often have the words Zea mays everta and popcorn occurred in a corpus of books? (source: Google Ngram Viewer )