dododo domdom domrud dordum dorood dororo doudou dourou drdoom dromo- dromod drummr dufour duhour dumdum durdum f-hour foofoo foofur foorum forhoo formo- foufou four-h fourof fourou furdom furfur furour furrfu h-hour ho-hum hoddom hodhur hodorf hohoho hohrod hoodoo hoohoo hooroo hormud hororo horror hudood huh-uh humhum hummum humour hurdom hurroo hurumu mfdoom mm-hmm moddom moddum moffom moffou mohoro mohuhu mommur moodur moomoo mordor mordru mormor mormur morodo mouddo mourou mudomo muffro muhuhu muhurr muhuru murdur murmur muumuu ofdoor offord ohohoh oohooh oooooo oordoo ordoru orford ormrod oromoo orrho- orrour rhodo- romour romrod rudrur ruhroh rumdum rumohr rumour u-form ufford uh-huh um-hum umhofo urdorf urform