| OAK
O | 16 | 402 |
| OAK | 16 | 1,336 |
| OAKA | 16 | 180 |
| OAKHAMPTON | 16 | 84 |
| OAKINGHAM | 16 | 144 |
| OANNES | 16 | 80 |
| OAR | 16 | 93 |
| OARISTUS | 16 | 72 |
| OASIS | 16 | 28 |
| OATH | 16 | 1,590 |
| OAXACA | 16 | 315 |
| OBA | 16 | 38 |
| OBADIAH | 16 | 78 |
| OBAN | 16 | 673 |
| OBELISK | 16 | 209 |
| OBERGLEICHEN | 16 | 74 |
| OBERNAY | 16 | 16 |
| OBERNIK | 16 | 56 |
| OBERZO | 16 | 53 |
| OBI | 16 | 201 |
| OBIDOS | 16 | 89 |
| OBJECT | 16 | 16 |
| OBJECTIVE | 16 | 32 |
| OBIT | 16 | 105 |
| OBLATE | 16 | 44 |
| OBLATI | 16 | 59 |
| OBLIGATION | 16 | 142 |
| OBLIQUE | 16 | 188 |
| OBLIQUUS | 16 | 15 |
| OBLONG | 16 | 55 |
| OBOJAN | 16 | 63 |
| OBREPTITIOUS | 16 | 22 |
| OBSCAIA | 16 | 39 |
| OBSCURE | 16 | 25 |
| OBSECRATION | 16 | 15 |
| OBSERVATION ISLAND | 16 | 26 |
| OBSERVATORY | 16 | 177 |
| OBSERVATORY ISLAND | 16 | 23 |
| OBSIDIONALIS | 16 | 24 |
| OBY | 16 | 93 |
| OCANA | 16 | 141 |
| OCCIDENT | 16 | 94 |
| OCCIPITAL | 16 | 17 |
| OCCULT | 16 | 116 |
| OCCULTATION | 16 | 28 |
| OCCUPANCY | 16 | 50 |
| OCEAN | 16 | 125 |
| OCEANIDES | 16 | 20 |
| OCEANUS | 16 | 178 |
| OCHLOCRACY | 16 | 14 |
| OCHRIDA | 16 | 115 |
| OCHUS | 16 | 83 |
| OCKLEY | 16 | 141 |
| OCKZAKOFF | 16 | 288 |
| OCRA | 16 | 26 |
| OCRISIA | 16 | 19 |
| OCTAETERIS | 16 | 39 |
| OCTAGON | 16 | 35 |
| OCTAHEDRON | 16 | 17 |
| OCTANT | 16 | 6 |
| OCTAPLA | 16 | 22 |
| OCTATEUCH | 16 | 12 |
| OCTAVIA | 16 | 89 |
| OCTAVIANUS | 16 | 618 |
| OCTOBER | 16 | 134 |
| OCTOSTYLE | 16 | 14 |
| ODDLY ODD | 16 | 37 |
| ODE | 16 | 11 |
| ODENATUS | 16 | 274 |
| ODENSEE | 16 | 72 |
| ODER | 16 | 93 |
| ODESSA | 16 | 2,991 |
| ODEUM | 16 | 65 |
| ODHAM | 16 | 90 |
| ODIN | 16 | 448 |
| ODOACER | 16 | 246 |
| ODOMETER | 16 | 11 |
| ODOROUS | 16 | 75 |
| OEDENBURG | 16 | 361 |
| OEGWA | 16 | 39 |
| OEHRINGEN | 16 | 73 |
| OELAND | 16 | 112 |
| OELS | 16 | 460 |
| OETTINGEN | 16 | 84 |
| OFFENBACH | 16 | 186 |
| OFFICIAL | 16 | 67 |
| OFFING | 16 | 78 |
| OGHAMS | 16 | 111 |
| OGIVE | 16 | 77 |
| OGYGES | 16 | 52 |
| OHANG JAVA | 16 | 24 |
| OHETEROA | 16 | 148 |
| OHHEVAHOA | 16 | 44 |
| OHIO | 16 | 6,899 |
| OHITTAHOO | 16 | 97 |
| OHRDRUFF | 16 | 93 |
| OIA | 16 | 19 |
| OIL | 16 | 15 |
| OISE | 16 | 471 |
| OKEHAM | 16 | 142 |
| OKHOTZK | 16 | 339 |
| OKIRAH | 16 | 20 |
| OLANGO | 16 | 18 |
| OLCHANSKAIA | 16 | 47 |
| OLDCASTLE | 16 | 875 |
| OLDENBURG | 16 | 684 |
| OLDHAM | 16 | 276 |
| OLDHAM, JOHN | 16 | 203 |
| OLDMIXON, JOHN | 16 | 80 |
| OLEKMA | 16 | 45 |
| OLEKMINSK | 16 | 61 |
| OLENEK | 16 | 36 |
| OLENUS | 16 | 68 |
| OLERON | 16 | 161 |
| OLIGARCHY | 16 | 30 |
| OLIVAREZ | 16 | 41 |
| OLIVE'S ISLAND | 16 | 25 |
| OLIVET | 16 | 38 |
| OLIVETAN, ROBERT | 16 | 150 |
| OLIVIER, CLAUDE MATTHIEU | 16 | 185 |
| OLLERTON | 16 | 65 |
| OLMUTZ | 16 | 172 |
| OLNEY | 16 | 135 |
| OLONEZ | 16 | 209 |
| OLOT | 16 | 183 |
| OLPAR | 16 | 60 |
| OLUTORA | 16 | 49 |
| OLYMPIA | 16 | 794 |
| OLYMPIAD | 16 | 244 |
| OLYMPIC GAMES | 16 | 666 |
| OM | 16 | 26 |
| OMA | 16 | 18 |
| OMAR EBN AL KHATTAB | 16 | 262 |
| OMBAY | 16 | 41 |
| OMBRE | 16 | 704 |
| OMBROMETER | 16 | 69 |
| OMEERSEER | 16 | 20 |
| OMELET | 16 | 20 |
| OMEN | 16 | 783 |
| OMER | 16 | 104 |
| OMERCUNTUC | 16 | 71 |
| OMERPOOR | 16 | 26 |
| OMMON | 16 | 1,257 |
| OMOA | 16 | 22 |
| OMOPHAGIA | 16 | 69 |
| OMPHALE | 16 | 216 |
| OMRATTEE | 16 | 54 |
| OMREE | 16 | 21 |
| OMSK | 16 | 106 |
| OMUDWARA | 16 | 348 |
| ONATEYA | 16 | 40 |
| ONEEHOW | 16 | 35 |
| ONEGA | 16 | 158 |
| ONEGLIA | 16 | 200 |
| ONEIROCRITICA | 16 | 188 |
| ONEIROCRITICS | 16 | 182 |
| ONEVY | 16 | 16 |
| ONGOLE | 16 | 123 |
| ONGOLOGUR | 16 | 25 |
| ONKELOS | 16 | 364 |
| ONOMANCIA | 16 | 55 |
| ONOMATOPOEIA | 16 | 112 |
| ONON | 16 | 47 |
| ONONDAGA | 16 | 206 |
| ONORE | 16 | 291 |
| ONOSANDER | 16 | 72 |
| ONRUST | 16 | 67 |
| ONTAREE | 16 | 27 |
| ONTARIO | 16 | 852 |
| ONTINIENTE | 16 | 123 |
| ONTONG JAVA | 16 | 33 |
| ONYCOMANCY | 16 | 76 |
| ONYX | 16 | 207 |
| OOJAIN | 16 | 1,203 |
| OON | 16 | 256 |
| OOREECHA | 16 | 16 |
| OOREY | 16 | 24 |
| OOSCATI | 16 | 113 |
| OOSCOTTA | 16 | 94 |
| OOSSOOR | 16 | 114 |
| OOTAPALLIUM | 16 | 22 |
| OOTATATOOR | 16 | 20 |
| OOTRADOORG | 16 | 29 |
| OOTRIMALOOR | 16 | 21 |
| OPALIA | 16 | 61 |
| OPARO | 16 | 48 |
| OPERA | 16 | 203 |
| OPHILOGY | 16 | 27 |
| OPHIOMANCY | 16 | 70 |
| OPHIR | 16 | 173 |
| OPHITES | 16 | 182 |
| OPHTHALMOSCOPY | 16 | 20 |
| OPIATES | 16 | 16 |
| OPINION | 16 | 237 |
| OPIUM | 16 | 34 |
| OPOCALPASUM | 16 | 55 |
| OPORTO | 16 | 2,409 |
| OPPIAN | 16 | 476 |
| OPPIDO | 16 | 62 |
| OPPILATION | 16 | 31 |
| OPQUIN | 16 | 86 |
| OPTIC ANGLE | 16 | 24 |
| OPTIC AXIS | 16 | 21 |
| OPTICS | 16 | 192,911 |
| OPTIMATES | 16 | 153 |
| OPTIO | 16 | 453 |
| ORACLE | 16 | 3,451 |
| ORAL | 16 | 25 |
| ORAN | 16 | 508 |
| ORANGE | 16 | 193 |
| ORANGE RIVER | 16 | 301 |
| ORANGE, SEA | 16 | 424 |
| ORATION | 16 | 153 |
| ORATORIO | 16 | 64 |
| ORATORY | 16 | 39 |
| ORBE | 16 | 123 |
| ORCHARD | 16 | 26 |
| ORCHESTRA | 16 | 86 |
| ORCHESTRINO | 16 | 68 |
| ORCHESTRION | 16 | 73 |
| ORCHIA LEX | 16 | 53 |
| ORCHILLA | 16 | 151 |
| ORCHON | 16 | 30 |
| ORCUS | 16 | 124 |
| ORDEAL | 16 | 3,459 |
| ORDER | 16 | 782 |
| ORDERS | 16 | 635 |
| ORDINAL NUMBERS | 16 | 12 |
| ORDINANCE | 16 | 130 |
| ORDINARY | 16 | 258 |
| ORDINATES | 16 | 28 |
| ORDINATION | 16 | 95 |
| ORDNANCE | 16 | 257 |
| ORDONNANCE | 16 | 172 |
| ORE | 16 | 101 |
| OREEHOUA | 16 | 30 |
| OREGON TERRITORY | 16 | 4,495 |
| OREL | 16 | 341 |
| ORELLANA | 16 | 126 |
| ORENBURG | 16 | 491 |
| ORENSE | 16 | 130 |
| ORESTES | 16 | 476 |
| ORFA | 16 | 1,286 |
| ORFFYREUS'S WHEEL | 16 | 252 |
| ORFORD | 16 | 126 |
| ORGAL | 16 | 8 |
| ORGAN | 16 | 5,378 |
| ORGANIST | 16 | 77 |
| ORGANO-LYRICON | 16 | 432 |
| ORGIA | 16 | 110 |
| ORGUES | 16 | 91 |
| ORGYA | 16 | 10 |
| ORIBASUS | 16 | 71 |
| ORICHALCUM | 16 | 1,535 |
| ORIGENIANS | 16 | 164 |
| ORIGENISTS | 16 | 125 |
| ORIGINAL | 16 | 17 |
| ORILLON | 16 | 38 |
| ORINOCO | 16 | 2,099 |
| ORION | 16 | 253 |
| ORISSA | 16 | 1,231 |
| ORISTANO | 16 | 58 |
| ORIZAYA | 16 | 14 |
| ORKNEY ISLANDS | 16 | 3,708 |
| ORLE | 16 | 31 |
| ORLEANS | 16 | 256 |
| ORLEANS | 16 | 166 |
| ORLOP | 16 | 31 |
| ORME | 16 | 1,539 |
| ORMEA | 16 | 50 |
| ORMOND | 16 | 86 |
| ORMSKIRK | 16 | 122 |
| ORMUZ | 16 | 1,388 |
| ORNE | 16 | 593 |
| ORNITHLÆ | 16 | 28 |
| ORNITHOLOGY | 16 | 39,192 |
| ORNITHOMANCY | 16 | 14 |
| OROBIO | 16 | 866 |
| ORONTES | 16 | 357 |
| OROPESA | 16 | 117 |
| OROTAVA | 16 | 165 |
| ORPHEOREON | 16 | 16 |
| ORPHEUS | 16 | 602 |
| ORPIMENT | 16 | 25 |
| ORRERY | 16 | 106 |
| ORSKAIA | 16 | 56 |
| ORTEGAL | 16 | 25 |
| ORTELIUS | 16 | 146 |
| ORTHEZ | 16 | 103 |
| ORTHODOX | 16 | 19 |
| ORTHOGRAPHIC PROJECTION OF THE SPHERE | 16 | 42 |
| ORTHOGRAPHY | 16 | 193 |
| ORTIVE | 16 | 40 |
| ORTON | 16 | 413 |
| ORVIETO | 16 | 81 |
| OSACCA | 16 | 71 |
| OSAGE | 16 | 85 |
| OSCHA | 16 | 14 |
| OSCHOPHORIA | 16 | 476 |
| OSENOKA | 16 | 11 |
| OSENEY ISLAND | 16 | 55 |
| OSILO | 16 | 33 |
| OSIMO | 16 | 84 |
| OSIRIS | 16 | 1,220 |
| OSKOL-STAROI | 16 | 62 |
| OSMANJIC | 16 | 15 |
| OSMANSKOI | 16 | 19 |
| OSNABRUCK | 16 | 471 |
| OSORIUS | 16 | 656 |
| OSSA | 16 | 56 |
| OSSAT | 16 | 2,497 |
| OSSERO | 16 | 85 |
| OSSIAN | 16 | 11,572 |
| OSSIFICATION | 16 | 25 |
| OSTADE | 16 | 181 |
| OSTEND | 16 | 110 |
| OSTERODE | 16 | 109 |
| OSTERVALD | 16 | 196 |
| OSTERWICK | 16 | 70 |
| OSTIA | 16 | 164 |
| OSTIAXS | 16 | 626 |
| OSTRACISM | 16 | 1,091 |
| OTAHEITE | 16 | 28 |
| OTAKOOTAI | 16 | 27 |
| OTHO | 16 | 412 |
| OTLEY | 16 | 82 |
| OTODINI | 16 | 262 |
| OTRAHERMANA | 16 | 22 |
| OTRANTO | 16 | 244 |
| OTTAJANO | 16 | 48 |
| OTTERBURN | 16 | 74 |
| OTTERY | 16 | 62 |
| OTTICOTTA | 16 | 20 |
| OTUNGURRA | 16 | 21 |
| OTWAY | 16 | 2,160 |
| OTWAY, CAPE | 16 | 20 |
| OTWEILER | 16 | 68 |
| OUCH | 16 | 62 |
| OUDANULLA | 16 | 86 |
| OUDE | 16 | 2,840 |
| OUDENARDE | 16 | 61 |
| OUDEYPOOR | 16 | 2,267 |
| OUDGHIR | 16 | 40 |
| OUEINING | 16 | 29 |
| OUE-KIUN | 16 | 49 |
| OUFA | 16 | 298 |
| OUGHTRID | 16 | 183 |
| OUKESIMA | 16 | 53 |
| OUNCE | 16 | 45 |
| OUND | 16 | 27 |
| OUNDLE | 16 | 509 |
| OURAL | 16 | 123 |
| OURALSK | 16 | 87 |
| OUROOMIA | 16 | 714 |
| OURRY'S ISLAND | 16 | 39 |
| OUSE | 16 | 3,954 |
| OVILO | 16 | 114 |
| OVULO | 16 | 49 |
| OWEN | 16 | 688 |
| OWHYHEE | 16 | 15 |
| OWLAH | 16 | 173 |
| OWLING | 16 | 32 |
| OWRAM | 16 | 93 |
| OXFORD | 16 | 4,982 |
| OXFORDSHIRE | 16 | 1,626 |
| OXGANG | 16 | 1,138 |
| OXIDATION | 16 | 19 |
| OXYGEN | 16 | 77 |
| OYER | 16 | 16 |
| OYES | 16 | 27 |
| OYOLA | 16 | 48 |
| OYSTER HARBOUR | 16 | 28 |
| OYSTER ISLAND | 16 | 68 |
| OZANAM | 16 | 1,067 |
| OZELL | 16 | 258 |
| OZERNAIA | 16 | 520 |