riverriver /ˈrɪvɚ/ noun 
► river
► river a long line of water that flows into the ocean or a lake: The Mississippi River flows into the Gulf of Mexico near the city of New Orleans. The Nile is the longest river in the world.
► stream a long narrow line of water that flows into a lake or into a river. A stream is usually too small to use a boat on: They drank water from mountain streams.
► creek a small river. A creek can be small and narrow and dry in the summer, or it can be wide enough to use a boat such as a canoe on it and have water all year: We were fishing in a little creek.
► brook brook means the same as stream and is usually used in written descriptions: A little frog hopped into the brook.
► canal a river that people have made so that boats or water can go from one place to another: The Panama Canal joins the Atlantic Ocean with the Pacific Ocean.
► delta a place where a large river spreads out and often divides into smaller rivers, before the water flows into the ocean: The Mississippi Delta is home to many kinds of wild birds and animals.
► tributary a river or stream that flows into a larger river: The Yellowstone River is a major tributary of the Missouri River.