From The Collaborative International Dictionary of English v.0.48:
Kail \Kail\, n. 1. (Bot.) A kind of headless cabbage. Same as Kale, 1. [1913 Webster]
2. Any cabbage, greens, or vegetables. [OE. or Scot.] [1913 Webster]
3. A broth made with kail or other vegetables; hence, any broth; also, a dinner. [Scot.] [1913 Webster]
Kail yard, a kitchen garden. [Scot.] [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Kale \Kale\, n. [Scot. kale, kail, cale, colewort, Gael. cael; akin to Ir. cal, W. cawl, Armor. kaol. See Cole.] [1913 Webster] 1. (Bot.) A variety of cabbage in which the leaves do not form a head, being nearly the original or wild form of the species. [Written also kail, and cale.] [1913 Webster]
2. See Kail, 2. [1913 Webster]
Sea kale (Bot.), a European cruciferous herb (Crambe maritima), often used as a pot herb; sea cabbage. [1913 Webster]