Western Siouan languages
The Western Siouan languages, also called Siouan proper or simply Siouan, are a large language family native to North America. They are closely related to the Catawban languages, sometimes called Eastern Siouan, and together with them constitute the Siouan (Siouan–Catawban) language family.
Assiniboine language
The Dakotan group of the Siouan family has five main divisions: Dakota (Santee-Sisseton), Dakota (Yankton-Yanktonai), Lakota (Teton), Nakoda (Assiniboine) and Nakoda (Stoney). Along with the closely related Stoney, Assiniboine is an n variety of the Dakotan languages, meaning its autonym is pronounced with an initial n (thus: "Nakʰóta" as opposed to "Dakʰóta" or "Lakʰóta", and "Nakʰóda" or "Nakʰóna" as opposed to "Dakʰód" or "Lakʰól"). The Assiniboine language is also closely related to the Sioux language and to the Stoney language (likewise called Nakoda or Nakota), although they are hardly mutually intelligible.