a particular kind or species of matter with uniform properties

colorless pungent crystalline compound derived from capsicum; source of the hotness of hot peppers of the genus Capsicum such as chili and cayenne and jalapeno

derived from ginger; source of the hotness of ginger

derived from pepper (especially black pepper); source of the hotness of black and white pepper

a family of compounds derived from horseradish and radishes and onions and mustards; source of the hotness of those plants and preparations