Butterbur is a herbaceous plant with broad leaves that is often used for medicinal purposes. However, not everyone is familiar with the term "butterbur" and may know it by other names. Some common synonyms for the word butterbur include coltsfoot, pestilence wort, plague flower, and flapperdock. The plant has also been called butterdock, bog rhubarb, and exwort. These synonyms may be useful for those who are researching the plant or trying to identify it in the wild. It is always important to know different names for botanicals to ensure better recognition and communication for its uses.