bholu bhool bhoom bhour blohm bloom bloor blorb bluhm blurb blurr bo-bo bo-ho bobr bohol bohor bolho boll- bollo bollu bombo bomlo bomoh boomb booru borbo bormo boro- borom boroo borou borro borul borum boul- boulo bouml brloh brmmm brobo brohl brohm broll brolo brom- bromo brool broom brrrr bruhl brull brumm bulb- bull- bulou bulul bumbo bumbu buoho burol buroo burro burru hbomb hhhhh hhour ho-ho ho-oh hobol hobor hobro hobub hohol hohum holbr hollo holo- holor holou holub holul holum homo- horol horom horro horru hubur huhuh hullo humbo humor humur huolu hurll hurm hurum huuru lbomb lobbo lobo- lobor lohho lohur lollo lolol lombo loobu loomb lorom lorum louro lubur lulom lulul lumb- lumbo mbolo mboro mbulu mburu mhorr mmhmm mmmmm mobor mobro mohol mohor mohur mollo mollu molor mombo mombu momlu mooll moolu mooro morbo mormo moror morou morro morum moulu mrmom mrorr mullo mulur mumbo mumlu mummu murlo murol murom muror murrh murro murru murum o-hum o-r-b obhor obolo oboro obrom oh-oh ohmmm ohour ohrob ohrum ollur olomu olour olumu omoro omulu ooooh ooooo orbom ormur orobo orolu oromo orrum oruro oullo ouoro ourol rhomb rhumb ro-ro robbo robo- robor robur rohob rohru rollo rolmo roomu rorbu roull roumm rubor ruhub rullo rumbo rummo rummu rumor ruomu ubobo uh-oh uh-uh uhhoh uhhuh uhuru ullur ulrum ululu uluru umblu umbro umhum umour uroob urour urubu uuuuu