b-room bbbbbb bhookh bo-hoo bobrok bokkom bokomo bokoro bombom bombur booboo boohoo boom-o borbor borkou borkum boroko boromo bororo boubou boukou bourou brokkr bromo- brubru bububu bukkur bukuru bumboo burbur burhou buruku h-bomb h-hour ho-hum hohoho hoohoo hookor hookum hooroo hororo horror hubbub hububb huh-uh hukkok humhub humhum hummum humour hurroo hurumu khoroo khoruk khorum khuhro khumbu koboko kohoku kokkoh kokoku kokomo kokoro kokubo komkor komoro komuro kookoo korkor kormuk koromo kororo koroum korubo koruru koubou koukou kouoro kourou krokom kukuom kum-bu kumbor kumbuk kumbum kumbur kumkum kummuh kumukh kurmuk kuroko kurukh kururu mbombo mbomou mborko mm-hmm mohoro mohuhu mokoro mommur momoko moomoo mooruk mormor mormur mourou mubuko muhuhu muhurr muhuru mukuro mukuru murmur muumuu o-hook ohohoh okumoo ombro- oohooh ookroo oooooo oromoo orrho- orrour rhomb- robomb rokkor rokuko rokuro romour rubro- rubrum ruhroh rumbur rumohr rumour ubombo uh-huh um-hum urhobo