| Oxygen | 6 |
| Oxygen --- | 10 |
| Oxygen allotrope | 16 |
| Oxygen and helium, for instance | 31 |
| Oxygen and neon | 15 |
| Oxygen atom's protons, e.g. | 31 |
| Oxygen bacterium | 16 |
| Oxygen barrier provider | 23 |
| Oxygen carrier | 14 |
| Oxygen cofounder Winfrey | 24 |
| Oxygen consumer | 15 |
| Oxygen discoverer | 17 |
| Oxygen doesn't have one | 27 |
| Oxygen emanating from a lawn? | 29 |
| Oxygen eschewer | 15 |
| Oxygen network co-founder | 25 |
| Oxygen or aluminum | 18 |
| Oxygen or helium | 16 |
| Oxygen or hydrogen | 18 |
| Oxygen processor | 16 |
| Oxygen producer | 15 |
| Oxygen producers | 16 |
| Oxygen providers | 16 |
| Oxygen releaser | 15 |
| Oxygen sex expert Johanson | 26 |
| Oxygen site: Abbr. | 18 |
| Oxygen source | 13 |
| Oxygen sources | 14 |
| Oxygen suppliers for scuba divers | 33 |
| Oxygen tent locale, briefly | 27 |
| Oxygen tent site, in brief | 26 |
| Oxygen user | 11 |
| Oxygen users | 12 |
| Oxygen variety | 14 |
| Oxygen ___ | 10 |
| Oxygen's 8: Abbr. | 21 |
| Oxygen's atomic number | 26 |
| Oxygen's electrons, e.g. | 28 |
| Oxygen's lack | 17 |
| Oxygen, e.g. | 12 |
| Oxygen, for instance | 20 |
| Oxygen, for one | 15 |
| Oxygen, simply | 14 |
| Oxygen-consuming bacterium | 26 |
| Oxygen-consuming organism | 25 |
| Oxygen-dependent bacterium | 26 |
| Oxygen-dependent creature | 25 |
| Oxygen-dependent organism | 25 |
| Oxygen-dependent organisms | 26 |
| Oxygen-deprived | 15 |
| Oxygen-loving organism | 22 |
| Oxygen-needing bacterium | 24 |
| Oxygen-needing organism | 23 |
| Oxygen-requiring microorganism | 30 |
| Oxygen-shunning organism | 24 |
| Oxygen-thriving organism | 24 |
| Oxygen-using organism | 21 |
| Oxygen-utilizing bacterium | 26 |
| Oxygen: Prefix | 14 |
| Oxygenate | 9 |
| Oxygenates | 10 |
| Oxygenating of venous blood | 27 |
| Oxygenating tool | 16 |
| Oxygenators | 11 |
| Oxygenize | 9 |
| Oxygenized sugar | 16 |
| Oxygens | 7 |
| Oxymoron for a homely person | 28 |
| Oxymoron from Charlie Brown | 27 |
| Oxymoron re Stephen Douglas | 27 |
| Oxymoronic "perhaps" | 30 |
| Oxymoronic amount | 17 |
| Oxymoronic attendee | 19 |
| Oxymoronic chances | 18 |
| Oxymoronic change of pace | 25 |
| Oxymoronic choice | 17 |
| Oxymoronic film title of 1994 | 29 |
| Oxymoronic group | 16 |
| Oxymoronic load of cash | 23 |
| Oxymoronic masterwork | 21 |
| Oxymoronic movie title, ''True ___'' | 52 |
| Oxymoronic novel genre | 22 |
| Oxymoronic office machine output | 32 |
| Oxymoronic Pa. town | 19 |
| Oxymoronic pain | 15 |
| Oxymoronic physical description | 31 |
| Oxymoronic picnic tableware | 27 |
| Oxymoronic place to work | 24 |
| Oxymoronic seclusion | 20 |
| Oxymoronic shellfish | 20 |
| Oxymoronic shrimp type | 22 |
| Oxymoronic success | 18 |
| Oxymoronically named British DJ __ Slim | 39 |
| OY | 2 |
| Oy, in Oberammergau | 19 |
| Oy, she's such a gossip | 27 |
| Oyez! | 5 |
| Oyl of cartoons | 15 |
| Oyl of comics | 13 |
| Oyl of fame | 11 |