"there is no technical difference between lakes and ponds, according to the National Park Service. While the distinction between lakes and ponds can be a bit blurry, there are some general guidelines. For example, if sunlight can reach the bottom of the entire body of water, it's generally considered a pond, according to the National Park Service. Conversely, if the body of water is deep enough in some places that sunlight cannot penetrate it, it's generally considered a lake.

When it comes to size, though, there are no exact guidelines. Ponds are generally smaller than lakes, but there's no universal standard. That means some things we call a pond might be considered a lake by some. And some lakes may be more pond-like to some people."

https://www.reconnectwithnature.org/news-events/the-buzz/whats-the-difference-lake-vs-pond/