The term SCHOOL ZONE can be broken down into two crossword solutions: OCEAN (5 letters) and SEA (3 letters). OCEAN is a large body of water that covers most of the Earth's surface, while SEA is a smaller body of saltwater that is partially enclosed by land. Both terms are used to describe large bodies of water, but OCEAN is generally used to refer to the entire planet's water, while SEA is used to refer to smaller bodies of water.