sea

noun

1. A large body of salt water.
2. A lake, especially if large or if salty or brackish.“The Caspian Sea, the Sea of Galilee, the Salton Sea, etc.”
3. The swell of the sea; a single wave; billow.
4. (in combination) Living or used in or on the sea; of, near, or like the sea.“Seaman, sea gauge, sea monster, sea horse, sea level, seaworthy, seaport, seaboard, etc.”