The term LEGEND'S COUSIN can be solved by the crossword solution MYTH, which is a four letter word. A MYTH is a traditional story that is usually based on ancient beliefs and is used to explain natural phenomena or the customs of a society. Myths often involve gods, heroes, and other supernatural characters and are passed down from generation to generation. Legends, on the other hand, are stories that are believed to be true and are often based on real events. Legends are usually associated with a particular place or person and are often used to explain the origins of a culture or tradition. Therefore, LEGEND'S COUSIN can be interpreted as MYTH, as myths are closely related to legends.