Body of water and Water tank

Body of water noun - The part of the earth's surface covered with water (such as a river or lake or ocean).

Water tank and body of water are semantically related. In some cases you can use "Water tank" instead a noun phrase "Body of water".

Water tank noun - A tank that holds the water used to flush a toilet.

Body of water and water tank are semantically related. You can use "Body of water" instead a noun phrase "Water tank".