The term 'white root vegetable' refers to two vegetables, PARSNIP and TURNIP. Parsnips are a root vegetable that is white in color and has a sweet flavor. They are related to carrots and have a long, tapered shape. Turnips are also a white root vegetable, but they are rounder in shape and have a slightly bitter taste. Both vegetables are popular in many cuisines around the world and can be cooked in a variety of ways.