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."

5. Anything resembling the vastness or turbulence of the sea.