luleh lulle luluc lulul luohe luoke lurch lurck lurer lurue o-r-b obele obhor obock obole obolo oboro oboue obreb obrok occur ocelo ocher ochl- ochre ochro ocker ockle ockro ocllo ocoee ocr-b ocree ocul- oculo oeco- oerel oerle oh-oh oh-ok ohchr ohelo ohler ohour ohrob okcho okeke okelo okere okhre okker okkur oklee okobo okoc okoho okole okoro okubo okuku okuru oleku oleo- olere olleo oller ollur olour oo-er oocre ooher ooooh ooooo orbec orble orech oreck oreco orell oreo- orere orero orhel orkel orlec orlek orlok orobe orobo oroch oroco oroer oroke orolu orube oruce oruch oruku oruro ouche oucho oullo ouoro ource oure- ourol r-co- rcolo rebbe rebec rebel reber rebol recce recco reche recke recue recur reece reech reere reerh rehco reher rehoe rehue rekel rekke rekle relee relek relko rello relue rere- reree rerob reuel reuer reule rheo- rhoeo ro-ro robbe robbo robec rober roble robo- robor robur rocco roche rocke rocko rocor rocou roell roero rohel rohle rohob rohru rokee roker rokke rokkk rokle roleo rollc rolle rollo rolok rooer rooke rookh roole roore rooue rorbu rorer rorke rouch rouer rouhe rouke rouko roule roulk roull roure rubee rubel ruber rubke ruble rubor rucer ruche rucul ruehl ruele ruell ruere ruhle ruhub rukel rukke ruler rullo rurec ruule u-cee ubble uber- ubobo uccel uccle uceku ucell ucero uchee ucheh uchku uchuu uclue uh-ee uh-oh uh-uh uhecr uhhoh uhhuh uhler uhuru ukeke ukobu ulcer ulche ulker ullur ulock ululu uluru uouee urcel urech urelu ureo- urkel urker uroob urour urubu uruce urucu uuork uuuuu