Sium sisarum, commonly known as skirret, is a root vegetable that has been used for centuries in culinary and medicinal applications. When it comes to synonyms for skirret, there aren't many options. In fact, skirret is a fairly uncommon vegetable and not widely known. However, there are a few terms that can be used to describe it, such as water parsnip or sweet cicely root. These two names are used regionally and may not be commonly recognized globally. The skirret is a sweet, nutty vegetable that is a cross between a parsnip and a carrot, and can be used in a variety of dishes for a unique flavor.