greens vs leaf vegetable

greens

noun
  • Leaves and leaf-like parts of edible plants when eaten as vegetables or in salads. 

  • Leafy plants that are used for decoration. 

  • The green dress uniform of the United States Marine Corps. 

  • Green vegetables; edible plants or plant parts that contain chlorophyll. 

leaf vegetable

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

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