kale
Synonym discussion
Sense: noun/1
Kale, cabbage, collard greens, spinach, and lettuce are all leafy greens, but they differ in texture, flavour, and how they are used. Cabbage forms a dense round head of tight pale leaves, whereas kale grows in loose bunches of dark curly or ruffled leaves with a tougher, earthier taste. Collard greens are closer to kale in flavour but have large flat leaves and are almost always cooked rather than eaten raw. Spinach is much more delicate — it wilts quickly when heated and has a milder, slightly sweet taste — so it works well in both raw salads and quick sautés. Lettuce is the mildest and crunchiest of the group, with a high water content that makes it unsuitable for cooking. For a simple roasted side dish, kale holds its shape better than spinach or lettuce; for a cold salad, young kale can replace lettuce or spinach when massaged with dressing to soften the leaves.
Etymology
The word 'kale' comes from Old English 'cāl' or 'cawel', meaning cabbage. This goes back to Latin 'caulis', meaning a stem or stalk of a plant — the same root that later gave us 'cole' (as in 'coleslaw'), 'cauliflower', and 'broccoli'. The spelling 'kale' developed in northern English and Scottish dialects, where it became the everyday name for this particular cabbage variety that does not form a head.