[{"Bold_text": "noun", "List Items": ["an extensive, level or slightly undulating, mostly treeless tract of land in the Mississippi valley, characterized by a highly fertile soil and originally covered with coarse grasses, and merging into drier plateaus in the west.Compare pampas , savanna , steppe .", "a tract of grassland; meadow.", "(in Florida) a low, sandy tract of grassland often covered with water.", "Southern U.S.wet grassland; marsh.", "(initial capital letter)a steam locomotive having a two-wheeled front truck, six driving wheels, and a two-wheeled rear truck."]}]