h-hour ho-hum hohoho hoohoo hoopoo hooroo hop-up hororo horror hrrmph huh-uh humhum hummum humour hurroo hurumu mm-hmm mohoro mohuhu mommur moomoo moopoo moorup mop-up mormor mormur morph- morpho morphu mourou muhuhu muhurr muhuru murmur muumuu ohohoh ohpooh oohooh oooooo oromoo oropom orrho- orrour phoro- pompom poopoo pop-up popopo poporo poppop porrum poupou pppppp proph- propho propup propur pumpup purpur romour ruhroh rumohr rumour uh-huh um-hum uppoor upprop uruppu