Romaine lettuce vs cos

Romaine lettuce

noun

  • A long-leafed variety of lettuce, Lactuca sativa var. longifolia. 

cos

noun

  • A variety of lettuce with long, crisp leaves. 

  • A cousin, cuz. 

conj

  • because 

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