Pumpkin relative is a term used to describe two vegetables that are related to pumpkins. The first is GOURD, which is a five letter word and is a type of squash that has a hard outer shell and is often used for decoration. The second is Butternut Squash, which is a fifteen letter word and is a type of winter squash with an oblong shape and sweet, nutty flavor. It is often used in soups and stews.