| oerbewoonster | aboriginal |
| Oercommunisme | Primitive communism |
| oerconservatief | ultraconservative |
| Oerdier | Protozoa |
| Oerel | Oerel |
| Oeren | Uren |
| Oerengoj | Urengoy |
| Oerengoj-gasveld | Urengoy gas field |
| Oergermaans | Proto-Germanic |
| Oering | Ering |
| oerknal | Big Bang |
| Oerknal-nucleosynthese | Big Bang nucleosynthesis |
| oerkomisch | hilarious |
| Oerkreet | Primal therapy |
| Oerle | Oreye |
| Oerlenbach | Oerlenbach |
| Oerlinghausen | Oerlinghausen |
| Oermens | Prehistoric man |
| Oernoords | Proto-Norse |
| Oeroes-Martan | Urus-Martan |
| oeros | aurochs |
| Oerprincipe | Capital |
| Oerschreeuw | Primal therapy |
| Oerslavisch | Common Slavic |
| Oersoep | Primordial sea |
| Oerstof | Element |
| oertijd | prehistory |
| oertype | archetype |
| Oervervelend | Dead boring |
| oerwoud | jungle |
| Oerwoudoorlogvoering | Jungle warfare |
| Oerzon | North American Porcupine |
| Oeschenbach | Oeschenbach |
| Oeschgen | Oeschgen |
| Oeschinenmeer | Oeschinen Lake |
| Oeserkaf | Userkaf |
| Oeserkare | Userkare |
| Oesinsk | Usinsk Airport |
| Oesjabti | Ushabti |
| oesjanka | ushanka |
| Oesjkoejniks | Ushkuiniks |
| OESO | OECD |
| Oesofagale reflux | Gastroesophageal reflux disease |
| Oesofagusvarices | Esophageal varices |
| Oesolje-Sibirskoje | Usolye-Sibirskoye |
| Oessoeri | Ussuri River |
| Oessoeriejsk | Ussuriysk |
| Oest-Dzjegoeta | Ust-Dzheguta |
| Oest-Ilimsk | Ust-Ilimsk |
| Oest-Koet | Ust-Kut |
| Oest-Omtsjoeg | Ust-Omchug |
| Oest-Orda Boerjatië | Ust-Orda Buryat Autonomous Okrug |
| Oest-Ordynski | Ust-Ordynsky |
| oester | oyster |
| Oesterdeichstrich | Oesterdeichstrich |
| Oestersaus | Oyster sauce |
| Oesterteelt | Oyester farming |
| Oesterwurth | Oesterwurth |
| Oestrich-Winkel | Oestrich-Winkel |
| oestrogeen | estrogen |
| oestrum | estrus |
| oestrum- | estrous |
| oestrus | estrus |
| oestrus- | estrous |
| Oethman ibn Affan | Uthman |
| Oetsoenomia | Utsunomiya |
| Oettern | Oettern |
| Oettingen in Bayern | Oettingen in Bayern |
| Oetwil am See | Oetwil am See |
| Oetwil an der Limmat | Oetwil an der Limmat |
| Oetz | Oetz |
| Oetzen | Oetzen |
| oeuvre | works |
| Oeuvre van Chopin | List of compositions by Frédéric Chopin |
| Oeuvre van Sergej Prokofjev | List of compositions by Sergei Prokofiev |
| Oeuvre van Sergej Rachmaninov | List of compositions by Sergei Rachmaninoff |
| oever | bank |
| oever- | riparian |
| oeverdam | levee |
| Oeverloper | Common Sandpiper |
| Oeversee | Oeversee |
| Oezbeek | Uzbek |
| Oezbeeks | Uzbek |
| Oezbeeks voetbalelftal | Uzbekistan national football team |
| Oezbeekse | Uzbek |
| Oezbeekse Socialistische Sovjetrepubliek | Uzbek SSR |
| Oezbekistan | Uzbekistan |
| Oezj | Uzh River |
| Oezjhorod | Uzhhorod |
| of | either ... or |
