endive vs escarole

endive

noun
  • A leafy salad vegetable, Cichorium endivia, which is often confused with common chicory (Cichorium intybus). 

escarole

noun
  • A subspecies or variety of broad-leaved endive (Cichorium endivia subsp. endivia, syn. Cichorium endivia var. latifolium), which is eaten as a vegetable. 

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