The term SEA GOD OF GREEK MYTH is NEREUS, a 6 letter word. Nereus was a sea god in Greek mythology, known as the Old Man of the Sea. He was the son of Pontus and Gaia, and was said to be able to change his shape into any creature of the sea. He was also the father of many sea nymphs, including the famous Nereids. He was known for his wisdom and knowledge of the sea, and was often consulted by other gods for advice.