| Text | Length |
| Oppidan | 7 |
| Opper creation | 14 |
| Oppenheimer's creation, colloquially | 40 |
| Oppenheimer's alma mater | 28 |
| Oppenheimer's agcy. | 23 |
| Oppenheimer subject | 19 |
| Oppenheimer opposed it | 22 |
| Oppenheimer development | 23 |
| Oppenheim sleuth | 16 |
| Opp. of WSW | 11 |
| Opp. of WNW | 11 |
| Opp. of withdrawal | 18 |
| Opp. of windward | 16 |
| Opp. of width | 13 |
| Opp. of vertical | 16 |
| Opp. of vert. | 13 |
| Opp. of syn. | 12 |
| Opp. of SSW | 11 |
| Opp. of SSE | 11 |
| Opp. of sold | 12 |
| Opp. of sing. | 13 |
| Opp. of sent | 12 |
| Opp. of real | 12 |
| Opp. of ques. | 13 |
| Opp. of pos. | 12 |
| Opp. of plaintiff | 17 |
| Opp. of opt. | 12 |
| Opp. of NNW | 11 |
| Opp. of NNE | 11 |
| Opp. of neg. | 12 |
| Opp. of masculine | 17 |
| Opp. of longitude | 17 |
| Opp. of long. | 13 |
| Opp. of local | 13 |
| Opp. of legato, in music | 24 |
| Opp. of legato | 14 |
| Opp. of horizontal | 18 |
| Opp. of fwd. | 12 |
| Opp. of feminine | 16 |
| Opp. of express | 15 |
| Opp. of E.T.A. | 14 |
| Opp. of down | 12 |
| Opp. of departure | 17 |
| Opp. of dep. | 12 |
| Opp. of Democrat | 16 |
| Opp. of days | 12 |
| Opp. of day | 11 |
| Opp. of antonym | 15 |
| Opp. of ant. | 12 |
| Opp. of a petitioner, in court | 30 |
| Opp. of "take out" | 28 |
| Opp. of ''prescription'' | 40 |
| Opossum's cousin | 20 |
| Opossum's branch grabber | 28 |
| Opossum shrimp | 14 |
| Oporto-to-Lisbon direção | 30 |
| Oporto's river | 18 |
| Oporto native, e.g. | 19 |
| Oporto greeting | 15 |
| Oplasm opener | 13 |
| Opium-derived analgesic | 23 |
| Opium, e.g. | 11 |
| Opium ___ | 9 |
| Opium source | 12 |
| Opium product | 13 |
| Opium poppies have them | 23 |
| Opium origin | 12 |
| Opium maker | 11 |
| Opium lounge | 12 |
| Opium locale | 12 |
| Opium flower | 12 |
| Opium farmer, often | 19 |
| Opium derivative | 16 |
| Opium compound | 14 |
| Opium byproduct | 15 |
| Opinon | 6 |
| Opinions, e.g. | 14 |
| Opinions offered | 16 |
| Opinions from a coward? | 23 |
| Opinions about books | 20 |
| Opinions | 8 |
| Opinionated work | 16 |
| Opinionated pieces | 18 |
| Opinionated ones | 16 |
| Opinionated Hannity and others | 30 |
| Opinionated equine | 18 |
| Opinionated Bill | 16 |
| Opinionated | 11 |
| Opinion; view | 13 |
| Opinion: Prefix | 15 |
| Opinion, forward or backward | 28 |
| Opinion, as it were | 19 |
| Opinion, after deflation? | 25 |
| Opinion website | 15 |
| Opinion to cherish? | 19 |
| Opinion that ladies can be as profane as gentlemen? | 51 |
| Opinion tester | 14 |
| Opinion takers | 14 |
| Opinion surveys | 15 |
| Opinion survey | 14 |
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