* "River" is usually a standalone noun. It rarely acts as a modifier in a compound word.
* Compound words often describe a specific object or concept. "River" is a broad term, and it's less common to use it to describe a specific thing.
Here are some examples of less common compound words with "river":
* Riverbank: The edge of a river.
* Riverbed: The bottom of a river.
* Riverboat: A boat that travels on a river.
* Riverfront: The area along a river.
* Riverine: Relating to or situated near a river.
Instead of compound words starting with "river," you'll often see phrases like:
* River valley: The area around a river.
* River crossing: A place where you can cross a river.
* River system: A network of rivers.
* River delta: The area at the mouth of a river where it enters a larger body of water.