| Cymric | bwn | Bittern, 125 |
| Cymric | bwncath | Buzzard, 211 |
| Franç.: Norm. | buan | braillard, FEW 20: 7 |
| Franç.: Pic. | buan | Lapwing, 158 |
| Franç.: Albertville | bwënyon | pleurnicheur, FEW 22: 61 |
| Franç.: Montauban | buyer | to sing, FEW 23: 142 |
| Franç.: Nantes | buyer | bruire, etc., FEW 23: 202 |
| Franç.: rég. | bue et var. | Buzzard, 211 |
| Franç.: centre | buar | Buzzard, 211 |
| Esp.: reg. | buero | Buzzard, 211 |
| Franç.: rég. | buor et var. | Bittern, 125 |
| Franç.: Poitou | boirer | chanter en conduisant les bœufs, FEW 23: 142 |
| Prov. | bueiro | dispute |
| Franç.: St.Pierre | boueirejá | faire du bruit dans les feuilles, FEW 23: 199 |
| Franç.: Ormonts | bweran.ná | gronder (tonnerre), FEW 23: 203 |
| Franç. (a.litt.) | reboer | retentir |
| Franç.: rég. | boué | Eagle Owl, 247 |
| Ital.: reg. | boèro | Eagle Owl, 247 |
| Ital.: Ligur. | boare, buaru | Curlew, 167 |
| Ital.: Ligur. | mariòli boaròi | Golden Plover, 161 |
| Ital.: Savona | boün | Lapwing, 158 |
| Ital.: Sic. | buarellu | Black-headed Gull, 90 |
| Ital.: Sic. | buarazza | Herring Gull, 81 |
| Anc.Greek | boao | to cry, roar |