h-hour ho-hum hohoho hoohoo hookor hookum hooroo hororo horror huh-uh hukkok humhum hummum humour hurroo hurumu khoroo khoruk khuhro kohoku kokkoh kokoku kokomo kokoro komkor komoro komuro kookoo korkor kormuk koromo kororo koroum koruru koukou kouoro kourou krokom kukuom kumkum kummuh kumukh kurmuk kuroko kurukh kururu mm-hmm mohoro mohuhu mokoro mommur momoko moomoo mooruk mormor mormur mourou muhuhu muhurr muhuru mukuro mukuru murmur muumuu o-hook ohohoh okumoo oohooh ookroo oooooo oromoo orrho- orrour rokkor rokuko rokuro romour ruhroh rumohr rumour uh-huh um-hum