Siouan-speaking refers to people who speak any of the languages belonging to the Siouan language family. Some synonyms for the word Siouan-speaking include Siouan, Sioux, Dakotan, and Dakota. The Dakota people are the largest ethnic group within the Siouan language family, while Sioux can be used to refer to both the Dakota and Lakota peoples. Other synonyms for Siouan-speaking include Mandan, Crow, Ho-Chunk, and Osage, which are all tribes that speak various Siouan languages. It's important to recognize the diverse cultural and linguistic identities within the Siouan-speaking community, and to use language that accurately reflects this diversity.