Lewis and Clark encountered numerous Native American tribes during their expedition, each with their own unique language.
Here are some examples:
* Mandan: This tribe, encountered along the Missouri River, had a language unrelated to any other known language family.
* Hidatsa: This tribe also lived along the Missouri River, and their language was closely related to the Mandan language.
* Shoshone: This tribe was encountered in the Rocky Mountains, and their language belongs to the Numic branch of the Uto-Aztecan language family.
* Nez Perce: This tribe lived in the Pacific Northwest, and their language belongs to the Sahaptin language family.
To give you a word, you would need to specify which tribe you are interested in.
To help you narrow it down, can you tell me which tribe you're curious about?