colewort

“Collards is a corruption of colewort — colewort is any non-heading cabbage,” said Dr. Harris, the author of “High on the Hog: A Culinary Journey From Africa to America.”

From New York Times ● Dec. 24, 2021

Basil, balm, borage, burnet, celery, chervil, colewort, coriander, corn-salad, cresses, endive, French fennel, lettuce, mint, mustard, nasturtiums, nettle-tops, parsley, pennyroyal, radishes, rape, sage, sorrel, spinage, tarragon, and water-cresses.

From The Cook and Housekeeper's Complete and Universal Dictionary; Including a System of Modern Cookery, in all Its Various Branches, Adapted to the Use of Private Families by Mary Eaton

Runts, the trunks of trees, the stem of colewort.

From The Modern Scottish Minstrel, Volume II. The Songs of Scotland of the past half century by Charles Rogers

Carrots, turnips, parsnips, potatoes, skirrets, onions, leeks, shalots, cabbage, savoys, colewort, spinach, cardoons, cresses, endive, celery, lettuces, salad, herbs.—Fruit.

From The Cook and Housekeeper's Complete and Universal Dictionary; Including a System of Modern Cookery, in all Its Various Branches, Adapted to the Use of Private Families by Mary Eaton

These words are evidently of the same class, though not of the same species with bishopric, colewort, spillikin, gossip, mainswearer, &c.

From A Handbook of the English Language by R. G. (Robert Gordon) Latham