Identify the different types of water bodies shown in the images: lake, river, sea, waterfall, and stream.

Here are the solutions for naming the water bodies:

1. Top Left Image: This image shows a large body of still water surrounded by land. The water body is a $\boxed{\text{lake}}$.

2. Top Right Image: This image shows a flowing body of water, wider than a stream, winding through the landscape. The water body is a $\boxed{\text{river}}$.

3. Middle Left Image: This image shows a vast expanse of saltwater, often with waves, meeting a coastline. The water body is a $\boxed{\text{sea}}$.

4. Middle Right Image: This image clearly shows water cascading down from a height. The water body is a $\boxed{\text{waterfall}}$.

5. Bottom Left Image: This image shows a narrow, flowing body of water, typically smaller than a river. The water body is a $\boxed{\text{stream}}$.