Riverboat is a word used to describe a vessel that is used for navigation on rivers. This type of boat is mainly associated with the American South and was frequently used during the 19th and early 20th centuries for transport, commerce, and leisure activities. While the term "riverboat" may be the most common way to describe these vessels, there are a few other synonyms that can be used, including steamboat, paddle wheeler, and river steamer. These alternatives may be used interchangeably with riverboat and are all used to convey the same idea - a boat that travels on rivers.