| Text | Length |
| OPEC units | 10 |
| OPEC units: abbr. | 17 |
| OPEC V.I.P. | 11 |
| OPEC vessel | 11 |
| OPEC's "gold" | 27 |
| OPEC's biggest customer | 27 |
| OPEC's concern | 18 |
| OPEC's export | 17 |
| OPEC's headquarters | 23 |
| OPEC's largest customer | 27 |
| OPEC, e.g. | 10 |
| OPEC, for one | 13 |
| OPEC, NATO, etc. | 16 |
| OPEC, notably | 13 |
| OPEC-sold intangible? | 21 |
| Opel car model | 14 |
| Opel model | 10 |
| Opel or Citroën | 18 |
| Opel or Cord | 12 |
| Open | 4 |
| Open (poetic) | 14 |
| Open as a bottle | 17 |
| Open (to) | 9 |
| Open --- of worms | 17 |
| Open a barrel | 13 |
| Open a bit | 10 |
| Open a bottle | 13 |
| Open a bottle of cheap beer? | 28 |
| Open a bottle of soda | 21 |
| Open a cage | 11 |
| Open a card game | 16 |
| Open a clasp | 12 |
| Open a compressed file | 22 |
| Open a crack | 12 |
| Open a door to | 14 |
| Open a fastening | 16 |
| Open a hasp | 11 |
| Open a keg | 10 |
| Open a large container | 22 |
| Open a leather jacket | 21 |
| Open a little | 13 |
| Open a medicine bottle | 22 |
| Open a package | 14 |
| Open a package, maybe | 21 |
| Open a pop | 10 |
| Open a prescription bottle | 26 |
| Open a prescription bottle, e.g. | 32 |
| Open a round, in poker | 22 |
| Open a seam | 11 |
| Open a smidgen | 14 |
| Open a soda bottle | 18 |
| Open a sugar packet | 19 |
| Open a tad | 10 |
| Open a tennis match | 19 |
| Open a thigh-high boot, maybe | 29 |
| Open a toothpaste tube | 22 |
| Open a tube | 11 |
| Open a wit | 10 |
| Open a __ worms | 15 |
| Open a ___ worms | 16 |
| Open acting audition | 20 |
| Open activity | 13 |
| Open admission | 14 |
| Open affirmations | 17 |
| Open African grasslands | 23 |
| Open an achievement, e.g. | 25 |
| Open an envelope | 16 |
| Open and breezy | 15 |
| Open and honest | 15 |
| Open and shut | 13 |
| Open and shut, e.g. | 19 |
| Open area for Robin Hood's men | 34 |
| Open area in the woods | 22 |
| Open areas in church | 20 |
| Open areas in office buildings | 30 |
| Open areas in the forest | 24 |
| Open areas of hotels | 20 |
| Open assertion | 14 |
| OPEN AT YOUR OWN RISK! | 22 |
| Open audition | 13 |
| Open audition, in slang | 23 |
| Open auto of old | 16 |
| Open autos of yore | 18 |
| Open ballot | 11 |
| Open boat | 9 |
| Open by moving a sliding rod | 28 |
| Open campus area | 16 |
| Open car | 8 |
| Open carriage | 13 |
| Open case | 9 |
| Open center in a structure | 26 |
| Open central courts | 19 |
| Open closing? | 13 |
| Open competitors, often | 23 |
| Open condemner | 14 |
| Open conflict | 13 |
| Open confrontations | 19 |
| Open container violator, often | 30 |
| Open contempt | 13 |
| Open country | 12 |
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