Root celery is a vegetable that is often used in cooking to add flavor to dishes. It can also be used as a healthier alternative to potatoes in many recipes. However, not everyone knows that there are many different synonyms for root celery. Some people refer to it as celeriac, knob celery, turnip-rooted celery, or simply celery root. Despite the different names, they all refer to the same vegetable. Celeriac is the most common synonym for root celery, and the one most people are familiar with. It is important to know these synonyms as they may be used on restaurant menus or recipe books.