[{"Bold_text": "noun", "List Items": ["a person or thing that rolls .", "a cylinder, wheel, caster, or the like, upon which something is rolled along.", "a cylindrical body, revolving on a fixed axis, especially one to facilitate the movement of something passed over or around it.", "a cylindrical object upon which something is rolled up:the roller of a window shade.", "a hollow, cylindrical object of plastic, stiff net, or the like, upon which hair is rolled up for setting.", "a cylindrical body for rolling over something to be spread out, leveled, crushed, smoothed, compacted, impressed, inked, etc.", "any of various other revolving cylindrical bodies, as the barrel of a music box.", "Metalworking.a person in charge of a rolling mill rolling mill.", "a long, swelling wave advancing steadily.Synonyms: comber , breaker", "a rolled bandage."]}, {"Bold_text": "noun", "List Items": ["any of several Old World birds of the family Coraciidae that tumble or roll over in flight, especially in the breeding season.", "tumbler(def9) tumbler(def9).", "one of a variety of canaries having a warbling or trilling song."]}]