| Answer | Crossword Clue |
|---|---|
| OTOE | Missouri River tribe |
| OSAGE | Missouri river or tribe |
| OSAGE | Missouri river named for an Indian tribe |
| OSAGE | Missouri tribe |
| OSAGES | Onetime Missouri tribe |
| OTOE | Tribe related to the Missouri |
| OTOE | Tribe allied with the Missouri, once |
| OTOE | Tribe that once joined with the Missouri |
| OTOE | Tribe related to the Iowa and Missouri |
