Words with "riv" meaning "river" or "bank":
* River: The most direct example, meaning a natural flowing watercourse.
* Riparian: Relating to or living on the banks of a river.
* Riverside: The area along the edge of a river.
* Riverbank: The land bordering a river.
* Rivery: Having many rivers or resembling a river.
Other words with "riv" that are not directly related to "river":
* Riveting: Extremely interesting and compelling. (This word is related to the verb "to rivet," which originally meant to fasten with a rivet, but now also means to hold someone's attention.)
* Riven: Split or torn apart, usually by force. (This word is related to the verb "to rive," meaning to split or tear.)
Let me know if you'd like more examples or have other root words you'd like to explore!