Missouri and Siouan

Missouri noun - A member of the Siouan people formerly inhabiting the valley of the Missouri river in Missouri.

Siouan and Missouri are semantically related. In some cases you can use "Siouan" instead a noun "Missouri".

Siouan noun - A member of a group of North American Indian peoples who spoke a Siouan language and who ranged from Lake Michigan to the Rocky Mountains.

Missouri and Siouan are semantically related. Sometimes you can replace term "Missouri" with "Siouan", this nouns are similar.