| Opp. of sent | 12 |
| Opp. of sing. | 13 |
| Opp. of sold | 12 |
| Opp. of SSE | 11 |
| Opp. of SSW | 11 |
| Opp. of syn. | 12 |
| Opp. of vert. | 13 |
| Opp. of vertical | 16 |
| Opp. of width | 13 |
| Opp. of windward | 16 |
| Opp. of withdrawal | 18 |
| Opp. of WNW | 11 |
| Opp. of WSW | 11 |
| Oppenheim sleuth | 16 |
| Oppenheimer development | 23 |
| Oppenheimer opposed it | 22 |
| Oppenheimer subject | 19 |
| Oppenheimer's agcy. | 23 |
| Oppenheimer's alma mater | 28 |
| Oppenheimer's creation, colloquially | 40 |
| Opper creation | 14 |
| Oppidan | 7 |
| Oppidan's locale | 20 |
| Opponent | 8 |
| Opponent for Andre | 18 |
| Opponent for Bjorn or Vitas | 27 |
| Opponent for Dempsey | 20 |
| Opponent for Ike | 16 |
| Opponent for Juan Belmonte | 26 |
| Opponent for Laver | 18 |
| Opponent for Louis | 18 |
| Opponent for Martina or Monica | 30 |
| Opponent for Minnesota Fats | 27 |
| Opponent for Monica | 19 |
| Opponent in an argument | 23 |
| Opponent in blackjack | 21 |
| Opponent in business or sports | 30 |
| Opponent of | 11 |
| Opponent of AES | 15 |
| Opponent of Brutus | 18 |
| Opponent of Caesar | 18 |
| Opponent of D.D.E. | 18 |
| Opponent of DDE | 15 |
| Opponent of Deep Blue, IBM's chess computer | 47 |
| Opponent of George and Bill | 27 |
| Opponent of government | 22 |
| Opponent of Hannibal | 20 |
| Opponent of Ike | 15 |
| Opponent of Jackson | 19 |
| Opponent of James II | 20 |
| Opponent of Jimmy and Arthur | 28 |
| Opponent of Lee | 15 |
| Opponent of Luther | 18 |
| Opponent of Luther during the Protestant Reformation | 52 |
| Opponent of management, at times | 32 |
| Opponent of Muhammad: 1978 | 26 |
| Opponent of Napoleon | 20 |
| Opponent of Pericles | 20 |
| Opponent of S. Grant | 20 |
| Opponent of Stalin | 18 |
| Opponent of the CAN-SPAM act | 28 |
| Opponent of the O's in the "Beltway Series" | 57 |
| Opponent of Tom and Harry in 1948 | 33 |
| Opponent of U. S. Grant | 23 |
| Opponent of Wade | 16 |
| Opponent of war | 15 |
| Opponent's call | 19 |
| Opponent's shout | 20 |
| Opponent's utterance | 24 |
| Opponent's vote | 19 |
| Opponents | 9 |
| Opponents of 'us' | 25 |
| Opponents of "shirts" | 31 |
| Opponents of "us" | 27 |
| Opponents of defense lawyers: Abbr. | 35 |
| Opponents of dualism | 20 |
| Opponents of nays | 17 |
| Opponents of Reps. | 18 |
| Opponents of the '60s-'70s New Left | 43 |
| Opponents of the 18th Amendment | 31 |
| Opponents of the GOP | 20 |
| Opponents of the Silver Surfer | 30 |
| Opponents of us | 15 |
| Opponents of Zeus | 17 |
| Opponents' separator in some sports | 39 |
| Opponents' votes | 20 |
| Opportune | 9 |
| Opportunely | 11 |
| Opportunist | 11 |
| Opportunist of a sort | 21 |
| Opportunist with tickets | 24 |
| Opportunist, in a way | 21 |
| Opportunist, maybe | 18 |
| Opportunistic adage | 19 |
| Opportunistic girl | 18 |
| Opportunistic one | 17 |
| Opportunists | 12 |
| Opportunities | 13 |
| Opportunities at home? | 22 |
| Opportunities at karaoke? | 25 |