Cocktail fruit is a type of fruit used to make alcoholic drinks. The two most common cocktail fruits are OLIVE and LIME, both of which have five and four letters respectively. Olives are small, oval-shaped fruits that are usually green or black in color. They are often used as a garnish for cocktails such as martinis. Limes are small, round citrus fruits that are usually green in color. They are often used to add flavor to cocktails such as margaritas.