Riverhead is a term that is commonly used to refer to the source of a river or stream. However, there are numerous other words that can be used to describe this location. One such word is "headwater," which also refers to the uppermost part of a river. Another synonym that can be used is "origin," which describes the place where the river begins. "Headstream" is another alternative, and it describes the stream that originates at the head of the river. Other synonyms for riverhead include "springhead," "wellhead," "fountainhead," and "resurgence." Overall, there are numerous words that can be used to describe the beginning of a river, each with its own unique connotation.