* Exist: The noun form of "exist" is existence. This refers to the state or fact of being real or living.
* Measure: The noun form of "measure" is measure itself. It can refer to:
* A standard of measurement: "The standard measure for a yard is 36 inches."
* The act of measuring: "We took a measure of the room to buy the right carpet."
* The amount or quantity: "The measure of his success is undeniable."
Let me know if you have any other words you'd like to find the noun form of!