ekokem emopop epomeo epopee euphem euphue heehee hehehe hehheh hekmeh heopop ho-hum hohoho hokpok homeo- homoe- hoohoo hookum hookup hoopee hoopoe hoopoo hop-up houeko huh-uh hukkok humhum hummum keepem keepme keepup keokee keokuk khomeh kohoku kokkoh kokoku kokomo kokopo kokopu kokpek komoe kookoo koopoo kopeek koppom koukou kukuom kumkum kummuh kumukh mehmke mehome mememe memome mm-hmm mohuhu mokume momoko mompeo moomoo moopoo mop-up mopoke muhuhu muumuu o-hook ohohoh ohpooh okopek okoume okpoko okumoo omemee oohooh oooooo oukoop peepee pempek pempem pokomo pompee pompeo pompeu pompom pookoo poompe poopoo pop-up popopo poppop poupee poupko poupou pouppe pppppp pu-hoe pukeko pumpee pumpup puukko uh-huh um-hum umuoke upkeep