Coleseed is a term that is commonly used to refer to a plant known botanically as Brassica napus. This plant is a member of the mustard family and is often cultivated for its seeds, which are used to produce cooking oil. Synonyms for coleseed include rapeseed, canola, and oilseed. Rapeseed is the most commonly used name for this plant in Europe, while canola is more frequently used in North America. Oilseed is a broader term that can refer to any plant that is used for oil production. Regardless of what name you use, coleseed plants are an important source of oil and are used in a variety of different foods and products.