b-roll b-room bbbbbb blubbo blublu bo-hoo bolbol bolbro bolhur bolobo bololo bombom bombur booboo boohoo boom-o borbor boromo bororo boubou boulou bourou bromo- bromol brubru bububu buholo bulbo- bulbul bullou bulolo bumboo burbur burhou burolo h-bomb h-hour ho-hum hoblob hohloh hohoho holhol holloo hollum holmul holoor holour hoohoo hooroo hororo horror hubbub hububb huh-uh hulloo hullur huluhu humbul humhub humhum hummum humour hurroo hurumu l-bomb l-hour lloro lobolo lollum lolobo loloru lomlom looloo loroum loulou lourlo lubbor luboml lumbo- lumbor lurulu mbombo mbomou mm-hmm moholl moholm mohoro mohuhu mollom molour mommur moobol moomoo mormor mormur morolo mourou muhuhu muhurr muhuru mullum mullur mulmul mulmur murmur muumuu ohohoh ombro- oohooh oooooo ormolu orobol oromoo orrho- orrour rhomb- robolo robomb romolo romour romulo rubro- rubrum ruhroh rumbur rumohr rumour ruurlo ubombo uh-huh ulloor um-hum umurlu urhobo