| OAK | 13 | 2,806 |
| OAKHAM | 13 | 739 |
| OATH | 13 | 3,536 |
| OATHLAW | 13 | 34 |
| OBADIAH | 13 | 471 |
| OBELISK | 13 | 20 |
| OBELISKS | 13 | 640 |
| OBJECT | 13 | 45 |
| OBJECTION | 13 | 22 |
| OBJECTIVE | 13 | 30 |
| OBIT | 13 | 108 |
| OBLATI | 13 | 56 |
| OBLIGATION | 13 | 146 |
| OBLIQUE | 13 | 117 |
| OBLIQUEUS | 13 | 21 |
| OBLONG | 13 | 14 |
| OBOLARIA | 13 | 50 |
| OBOLUS | 13 | 73 |
| OBOOTH | 13 | 88 |
| OBRECHT | 13 | 125 |
| OBREPTITIOUS | 13 | 22 |
| OBSCURE | 13 | 24 |
| OBSECRATION | 13 | 14 |
| OBSEQUENS | 13 | 43 |
| OBSEQUIES | 13 | 7 |
| OBSERVATION | 13 | 19 |
| OBSERVATORY | 13 | 2,095 |
| OBSIDIONALIS | 13 | 15 |
| OBSTETRICS | 13 | 8 |
| OBSTRUCTION | 13 | 30 |
| OBTURATOR | 13 | 8 |
| OBTUSE | 13 | 18 |
| OBY | 13 | 251 |
| OCCIDENT | 13 | 49 |
| OCCIPITAL | 13 | 17 |
| OCCULT | 13 | 113 |
| OCCULTATION | 13 | 26 |
| OCCUPANCY | 13 | 1,559 |
| OCEANUS | 13 | 212 |
| OCEIA | 13 | 108 |
| OCELLOT | 13 | 5 |
| OCELOXOCHITL | 13 | 57 |
| OCHINUS | 13 | 899 |
| OCHLOCRACY | 13 | 13 |
| OCHNA | 13 | 46 |
| OCHRE | 13 | 38 |
| OCHROMA | 13 | 134 |
| OCHUS | 13 | 177 |
| OCKHAM | 13 | 458 |
| OCKLEY | 13 | 285 |
| OCRISIA | 13 | 92 |
| OCTAETERIS | 13 | 39 |
| OCTAGON | 13 | 47 |
| OCTAHEDRON | 13 | 17 |
| OCTANDRIA | 13 | 35 |
| OCTANT | 13 | 24 |
| OCTAPLA | 13 | 35 |
| OCTATEUCH | 13 | 12 |
| OCTAVIA | 13 | 528 |
| OCTAVIANUS | 13 | 833 |
| OCTOBER | 13 | 128 |
| OCTOSTYLE | 13 | 14 |
| OCULUS | 13 | 159 |
| OCYMUM | 13 | 204 |
| OCZAKOW | 13 | 54 |
| ODA | 13 | 336 |
| ODE | 13 | 12 |
| ODED | 13 | 240 |
| ODENSEE | 13 | 255 |
| ODENATUS | 13 | 283 |
| ODER | 13 | 91 |
| ODEUM | 13 | 64 |
| ODIN | 13 | 708 |
| ODIN'S F | 13 | 72 |
| ODINUS | 13 | 404 |
| ODO | 13 | 143 |
| ODOACER | 13 | 249 |
| ODONTALGIA | 13 | 8 |
| ODONTOIDE | 13 | 21 |
| ODOROUS | 13 | 24 |
| ODYSSEY | 13 | 495 |
| OECONOMICS | 13 | 33 |
| OECONOMY | 13 | 63 |
| OECUMENICAL | 13 | 12 |
| OEDEMA | 13 | 113 |
| OEDERA | 13 | 40 |
| OEDIPUS | 13 | 238 |
| OEGWA | 13 | 392 |
| OELAND | 13 | 69 |
| OENANTHE | 13 | 797 |
| OENKJE | 13 | 32 |
| OENOS | 13 | 54 |
| OENOTHERA | 13 | 449 |
| OENOTRIA | 13 | 137 |
| OESEL | 13 | 56 |
| OESOPHAGUS | 13 | 32 |
| OESTRUS | 13 | 656 |
| OETA | 13 | 165 |
| OETING | 13 | 133 |
| OFFA'S-DYKE | 13 | 28 |
| OFFANTO | 13 | 48 |
| OFFENCE | 13 | 15 |
| OFFERINGS | 13 | 401 |
| OFFICE | 13 | 786 |
| OFFICER | 13 | 364 |
| OFFICIAL | 13 | 42 |
| OFFICINAL | 13 | 48 |
| OFFING | 13 | 78 |
| OFFSETS | 13 | 49 |
| OGEE | 13 | 29 |
| OGHAMS | 13 | 150 |
| OGILBY | 13 | 420 |
| OGIVE | 13 | 76 |
| OGYGES | 13 | 49 |
| OGYGIA | 13 | 45 |
| OGYIA | 13 | 26 |
| OHIO | 13 | 129 |
| OIL | 13 | 762 |
| OILS | 13 | 1,051 |
| OKEHAM | 13 | 40 |
| OKINGHAM | 13 | 29 |
| OLAX | 13 | 41 |
| OLD AGE | 13 | 1,569 |
| OLDCASTLE | 13 | 242 |
| OLDENBURG | 13 | 936 |
| OLDENLANDIA | 13 | 85 |
| OLDHAM | 13 | 207 |
| OLD-HEAD | 13 | 140 |
| OLDMIXON | 13 | 105 |
| OLD-WOMAN'S ISLAND | 13 | 88 |
| OLEA | 13 | 1,902 |
| OLEAGINOUS | 13 | 16 |
| OLEANDER | 13 | 378 |
| OLEARIUS | 13 | 308 |
| OLENUS | 13 | 518 |
| OLIBANUM | 13 | 362 |
| OLIGARCHY | 13 | 16 |
| OLIO | 13 | 190 |
| OLISIPO | 13 | 97 |
| OLIVAREZ | 13 | 1,396 |
| OLIVE | 13 | 513 |
| OLIVET | 13 | 452 |
| OLIVETAN | 13 | 158 |
| OLIVIER | 13 | 300 |
| OLMUTZ | 13 | 93 |
| OLOCENTROS | 13 | 82 |
| OLYMPIA | 13 | 995 |
| OLYMPIA | 13 | 877 |
| OLYMPIAD | 13 | 244 |
| OLYMPIAS | 13 | 321 |
| OLYMPIC GAMES | 13 | 1,663 |
| OLYMPUS | 13 | 184 |
| OLYRA | 13 | 58 |
| OMAR | 13 | 2,021 |
| OMBRE | 13 | 1,159 |
| OMEN | 13 | 1,477 |
| OMENTUM | 13 | 1,837 |
| OMOPHAGIA | 13 | 65 |
| OMPHACINE | 13 | 97 |
| OMPHALE | 13 | 372 |
| OMPHALEA | 13 | 69 |
| OMPHALO-MESENTERIC | 13 | 60 |
| OMRAH | 13 | 478 |
| ONANIA | 13 | 1,027 |
| ONCA | 13 | 108 |
| ONEGA | 13 | 56 |
| ONEGLIA | 13 | 95 |
| ONEIROCRITICA | 13 | 177 |
| ONEIROCRITICS | 13 | 177 |
| ONESILE THERMAE | 13 | 131 |
| ONGLEE | 13 | 28 |
| ONION | 13 | 237 |
| ONISCUS | 13 | 406 |
| ONKELOS | 13 | 543 |
| ONKOTOMY | 13 | 11 |
| ONOCLEA | 13 | 29 |
| ONOMANCIA | 13 | 58 |
| ONOMATOPOEIA | 13 | 108 |
| ONONIS | 13 | 37 |
| ONOPORDUM | 13 | 24 |
| ONOSANDER | 13 | 70 |
| ONOSMA | 13 | 38 |
| ONTARIO | 13 | 56 |
| ONUPHRIUS PANVINUS | 13 | 123 |
| ONYCOMANCY | 13 | 70 |
| ONYX | 13 | 173 |
| OONALASHKA | 13 | 367 |
| OONELLA | 13 | 66 |
| OORT | 13 | 319 |
| OOST | 13 | 339 |
| OPACITY | 13 | 15 |
| OPAH | 13 | 561 |
| OPAL | 13 | 1,556 |
| OPALIA | 13 | 60 |
| OPERA | 13 | 483 |
| OPERATION | 13 | 36 |
| OPHIDIUM | 13 | 922 |
| OPHIOLGLOSSUM | 13 | 490 |
| OPHIOXYLON | 13 | 46 |
| OPHIR | 13 | 5,375 |
| OPHIRA | 13 | 28 |
| OPHITES | 13 | 785 |
| OPHTHALMIA | 13 | 22 |
| OPIATES | 13 | 506 |
| OPITS | 13 | 88 |
| OPIUM | 13 | 1,720 |
| OPOBALSAMUM | 13 | 507 |
| OPOCALPASUM | 13 | 1,226 |
| OPORTO | 13 | 90 |
| OPPENHEIM | 13 | 38 |
| OPPIANUS | 13 | 55 |
| OPPILATION | 13 | 81 |
| OPTIC ANGLE | 13 | 24 |
| OPTIC AXIS | 13 | 20 |
| OPTICS | 13 | 155,302 |
| OPTIMATES | 13 | 157 |
| OPTIO | 13 | 107 |
| OPTION | 13 | 140 |
| OPUNTIA | 13 | 653 |
| ORACLE | 13 | 3,584 |
| ORAE | 13 | 47 |
| ORAL | 13 | 21 |
| ORAN | 13 | 120 |
| ORANGE | 13 | 1,235 |
| ORATION | 13 | 620 |
| ORATORIO | 13 | 240 |
| ORATORY | 13 | 116,108 |
| ORB | 13 | 137 |
| ORBIT | 13 | 54 |
| ORCHARD | 13 | 2,613 |
| ORCHIS | 13 | 1,498 |
| ORCUS | 13 | 121 |
| ORDEAL | 13 | 5,110 |
| ORDERS | 13 | 794 |
| ORDINAL | 13 | 24 |
| ORDINANCE | 13 | 159 |
| ORDINARY | 13 | 443 |
| ORDINATES | 13 | 30 |
| ORDINATION | 13 | 405 |
| ORDNANCE | 13 | 2,453 |
| ORELLANA | 13 | 127 |
| ORENSE | 13 | 51 |
| ORESTES | 13 | 1,024 |
| ORFA | 13 | 82 |
| ORFORD | 13 | 280 |
| ORGAGNA | 13 | 88 |
| ORGAN | 13 | 4,434 |
| ORGIA | 13 | 110 |
| ORGUES | 13 | 179 |
| ORIBASIA | 13 | 101 |
| ORIBASUS | 13 | 72 |
| ORICHALCUM | 13 | 1,541 |
| ORIFICE | 13 | 11 |
| ORIGANUM | 13 | 324 |
| ORIENT | 13 | 61 |
| ORIGEN | 13 | 1,974 |
| ORIGENIANS | 13 | 133 |
| ORIGENISTS | 13 | 124 |
| ORIGINAL | 13 | 91 |
| ORIGUELA | 13 | 85 |
| ORILLON | 13 | 42 |
| ORIOLES | 13 | 1,204 |
| ORION | 13 | 919 |
| ORISTAGNI | 13 | 51 |
| ORIXA | 13 | 147 |
| ORKNEY ISLANDS | 13 | 6,141 |
| ORLE | 13 | 53 |
| ORLEANOIS | 13 | 171 |
| ORLEANS | 13 | 1,273 |
| ORMOND | 13 | 332 |
| ORMUS | 13 | 482 |
| ORNITHOLOGY | 13 | 6,096 |
| ORDERS OF BIRDS | 13 | 29 |
| ORDO II | 13 | 260 |
| ORNITHOMANCY | 13 | 18 |
| ORNITHOPUS | 13 | 39 |
| ORNUS FRAXINUS | 13 | 161 |
| OROBANCHE | 13 | 49 |
| OROBIO | 13 | 1,768 |
| ORPHEUS | 13 | 3,506 |
| ORPIMENT | 13 | 558 |
| ORRERY | 13 | 1,462 |
| ORTHODOX | 13 | 19 |
| ORTHOGRAPHIC PROJECTION OF THE SPHERE | 13 | 46 |
| ORTHOGRAPHY | 13 | 131 |
| ORTHOPNOEA | 13 | 35 |
| ORTIVE | 13 | 45 |
| ORTNAU | 13 | 74 |
| ORTYGIA | 13 | 158 |
| ORVIETO | 13 | 311 |
| ORYZA | 13 | 880 |
| ORYZIVERA | 13 | 411 |
| OSBORN | 13 | 161 |
| OSCHOPHORIA | 13 | 480 |
| OSCILLA | 13 | 121 |
| OSENEY-ISLAND | 13 | 55 |
| OSIRIS | 13 | 1,218 |
| OSMUNDA | 13 | 80 |
| OSNABURG | 13 | 1,144 |
| OSORIUS | 13 | 670 |
| OSSA | 13 | 140 |
| OSSAT | 13 | 170 |
| OSSIAN | 13 | 8,978 |
| OSSIFICATION | 13 | 536 |
| OSSIFRAGUM | 13 | 193 |
| OSSORY | 13 | 12 |
| OSSUNA | 13 | 28 |
| OSTADE | 13 | 175 |
| OSTALRIC | 13 | 37 |
| OSTEND | 13 | 260 |
| OSTEOCOLLA | 13 | 855 |
| OSTEOLOGY | 13 | 13 |
| OSTERVALD | 13 | 615 |
| OSTIACKS | 13 | 1,079 |
| OSTRACION | 13 | 55 |
| OSTRACISM | 13 | 1,330 |
| OSTRACITES | 13 | 231 |
| OSTREA | 13 | 2,045 |
| OSTROVIZZA | 13 | 112 |
| OSTUNI | 13 | 50 |
| OSWEGO | 13 | 23 |
| OSWEIZEN | 13 | 38 |
| OSWESTRY | 13 | 421 |
| OSYMANDES | 13 | 648 |
| OTACOUSTIC INSTRUMENT | 13 | 13 |
| OTAHEITEE | 13 | 16,899 |
| OTALGIA | 13 | 10 |
| OTELANDS | 13 | 273 |
| OTHNIEL | 13 | 370 |
| OTHO | 13 | 945 |
| OTHONNA | 13 | 44 |
| OTHRYADES | 13 | 112 |
| OTIS | 13 | 434 |
| OTLEY | 13 | 129 |
| OTODINI | 13 | 268 |
| OTRANTO | 13 | 665 |
| OTTER | 13 | 9 |
| OTTERBURN | 13 | 87 |
| OTTERY | 13 | 148 |
| OTWAY | 13 | 587 |
| OVAL | 13 | 87 |
| OVARIUM | 13 | 32 |
| OVATION | 13 | 142 |
| OUDENARDE | 13 | 192 |
| OUDRI | 13 | 211 |
| OVERALL | 13 | 645 |
| OVERBURY | 13 | 730 |
| OVER-HAULING | 13 | 115 |
| OVERSMAN | 13 | 26 |
| OVERT | 13 | 30 |
| OVERTURE | 13 | 54 |
| OVERYSSEL | 13 | 168 |
| OVIEDA | 13 | 96 |
| OUGHTRED | 13 | 343 |
| OVID | 13 | 1,062 |
| OVIEDO | 13 | 303 |
| OVILIA | 13 | 27 |
| OVIPAROUS | 13 | 94 |
| OVIS | 13 | 9,313 |
| OUNCE | 13 | 54 |
| OVOLO | 13 | 46 |
| OU-POEY-TSE | 13 | 1,562 |
| OUTWORKS | 13 | 20 |
| OUZEL | 13 | 6 |
| OWEN | 13 | 927 |
| OWHYHEE | 13 | 2,077 |
| OWLING | 13 | 247 |
| OXALIS | 13 | 128 |
| OXFORD | 13 | 2,359 |
| OXFORDSHIRE | 13 | 256 |
| OXGANG | 13 | 25 |
| OXUCLEAE | 13 | 85 |
| OXUS | 13 | 100 |
| OXYCRATE | 13 | 29 |
| OXYD | 13 | 860 |
| OXYGENE | 13 | 454 |
| OXYGLYCU | 13 | 69 |
| OXYMEL | 13 | 10 |
| OYER | 13 | 16 |
| OYES | 13 | 27 |
| OYSTER | 13 | 814 |
| OZANAM | 13 | 308 |
| OZELL | 13 | 109 |
| OZIAS | 13 | 195 |
| OZLEWORTH | 13 | 35 |
| OZOLE | 13 | 585 |
| OASIS | 502 | 84 |
| OBELISK CIRCLE | 502 | 15 |
| OBELISK DEPRESSION | 502 | 25 |
| OBELISK FORCE | 502 | 49 |
| OBLONG SPHEROID | 502 | 43 |
| OBSERVATORY | 502 | 6 |
| OCCIDENTAL EQUINOCTIAL | 502 | 66 |
| OCTANT | 502 | 6 |
| ODD | 502 | 22 |
| ODDLY-ODD | 502 | 36 |
| ODOUR | 502 | 7,798 |
| OMPHALOPTER | 502 | 17 |
| ONISCUS | 502 | 543 |
| OPAQUE | 502 | 455 |
| OPEN FLANK | 502 | 39 |
| OPERA GLASS | 502 | 618 |
| OPHIUCUS | 502 | 9 |
| OPIUM | 502 | 547 |
| OPTIC INEQUALITY | 502 | 4,681 |
| OSCILLATION | 502 | 131 |
| OSCULATION | 502 | 1,985 |
| OXYGLYCUS CERASUS | 502 | 327 |
| OXY-MURIATIC ACID | 502 | 3,511 |