Mammoth Uncensored Word List:
103 - 11 letter words starting with or

oracularity oraculously orangeberry orangewoods orangutangs orbiculares orbicularis orbicularly orbiculated orchardings orchardists orchestrate orchestrina orchestrion orchidology orchiectomy ordainments orderliness ordinariest ordinations ordonnances orecchiette orecchietti oreographic oreological oreologists orepearched orepearches organically organicisms organicists organisable organistrum organizable organograms organologic organotroph orientalise orientalism orientalist orientality orientalize orientating orientation orientative orientators orienteered originality originating origination originative originators ornamentals ornamenters ornamenting ornamentist ornithology ornithopods ornithopter ornithosaur oroelogical orographers orographies orphanhoods orpheoreons orthoborate orthocaines orthocenter orthocentre orthoclases orthodeoxia orthodontia orthodontic orthodoxies orthodromic orthoepical orthoepists orthogenics orthognathy orthographs orthography orthologous orthonormal orthopaedic orthopedias orthopedics orthopedies orthopedist orthophyres orthophyric orthopnoeas orthopnoeic orthopraxes orthopraxis orthoprisms orthopteran orthopteron orthoptists orthoscopes orthoscopic orthostatic orthostichy orthotropic