Wasabi is a spicy Japanese condiment used with sushi, sashimi, and noodle dishes. Some synonyms for wasabi include horseradish, green mustard, and Wasabia japonica. Horseradish is a spicy plant root that is often used as a substitute for wasabi. Green mustard refers to the green coating on the outside of the wasabi root, which is grated to form the paste commonly used in Japanese cuisine. Wasabia japonica is the technical name for the plant that produces the wasabi root. Other synonyms for wasabi may include hot, pungent, fiery, and tangy, all of which accurately describe the unique flavor profile of this popular condiment.