endive vs witloof

endive

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

witloof

noun
  • Belgian endive, common chicory (Cichorium intybus) 

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