leaf vegetable vs potato salad

leaf vegetable

noun
  • The leaf of a plant used as an edible vegetable, such as lettuce, spinach, or rocket. 

potato salad

noun
  • A salad made from chopped boiled potatoes and a variety of other ingredients in a dressing. 

How often have the words leaf vegetable and potato salad occurred in a corpus of books? (source: Google Ngram Viewer )