Mustard seed is a tiny, edible seed that packs a punch of flavor. It is commonly used as a spice in many dishes and is a popular ingredient in condiments such as mustard. There are several synonyms for mustard seed, including Brassica juncea, Indian mustard, brown mustard seeds, and black mustard seeds. These seeds may vary in size, color, and flavor, but they all have the same pungent and earthy taste that defines the flavor of mustard. Whether you are looking to add a hint of spice to your food or want to create a delicious homemade condiment, any of these alternatives to mustard seed will do the trick.