A relish tray item is a type of food that is served as part of a relish tray, which is a type of appetizer platter. The three items that can be found on a relish tray are radish (6 letters), CELERY (6 letters), and OLIVE (5 letters). Radishes are root vegetables that are usually eaten raw and have a slightly spicy flavor. CELERY is a crunchy vegetable that is often used in salads or as a snack. Olives are a type of fruit that are usually pickled and used as a garnish or condiment.