| BU | robbery on the high seas |
|---|---|
| BU | a muscle that flatten the cheek and retracts the angle of the mouth |
| BU | whelks |
| BU | puffbirds |
| BU | buffleheads and goldeneyes |
| BU | North American goldeneye diving duck |
| BU | small North American diving duck |
| BU | large-headed swift-flying diving duck of arctic regions |
| BU | type genus of the family Bucerotidae |
| BU | hornbills |
| BU | 15th President of the United States (1791-1868) |
| BU | capital and largest city of Romania in southeastern Romania |