The crossword solution for the term 'JUPITER's Greek counterpart' is Zeus, which is a four-letter word. Zeus is the king of the gods in Greek mythology and is the father of many of the gods and goddesses. He is the god of the sky, lightning, thunder, law, order, and justice. He is also the ruler of Mount Olympus, the home of the gods. Zeus is the counterpart to JUPITER, the king of the gods in Roman mythology.