| Text | Length |
| On-ramp sign | 12 |
| On-screen avatar | 16 |
| On-screen effect | 16 |
| On-screen image | 15 |
| On-screen lists | 15 |
| On-screen medic | 15 |
| On-screen OB/GYN | 16 |
| On-screen plane? | 16 |
| On-screen read | 14 |
| On-screen ship? | 15 |
| On-screen stand-in | 18 |
| On-site supervisor? | 19 |
| On-stage blunders | 17 |
| On-tap serving | 14 |
| On-the-cob serving | 18 |
| On-the-cob treat | 16 |
| On-the-go diva? | 15 |
| On-the-go group | 15 |
| On-the-go meals | 15 |
| On-the-job extra | 16 |
| On-the-job extras | 17 |
| On-the-job learner | 18 |
| On-the-job reward | 17 |
| On-the-job trainee | 18 |
| On-the-rack item? | 17 |
| On-the-sly event | 16 |
| On-the-sly meeting | 18 |
| On-the-spot name | 16 |
| On-the-water front | 18 |
| On-time tax return? | 19 |
| On-track Bobby | 14 |
| On-___ (rumor) | 14 |
| On/off ramp pattern | 19 |
| On/off routes | 13 |
| On/off switch | 13 |
| On/off wall device | 18 |
| Onager or dunce | 15 |
| Onager, e.g. | 12 |
| Onager, for example | 19 |
| Onager, for one | 15 |
| Onager, in Oise | 15 |
| Onagers: Fr. | 12 |
| Onassis familiarly | 19 |
| Onassis and others | 18 |
| Onassis et al. | 14 |
| Onassis nickname | 16 |
| Onassis of shipping | 19 |
| Onassis or Meyers | 17 |
| Onassis patriarch | 17 |
| Onassis to pals | 15 |
| Onassis' X | 14 |
| Onassis's X | 15 |
| Onassis, briefly | 16 |
| Onassis, familiarly | 19 |
| Onassis, for one | 16 |
| Onassis, for one. | 17 |
| Onassis, for short | 18 |
| Onassis, informally | 19 |
| Onassis, to friends | 19 |
| Onassis, to Jackie | 18 |
| Onassis, to pals | 16 |
| Onboard affirmation | 19 |
| Onc ward treatment | 18 |
| Once formerly | 14 |
| Once -- blue moon | 17 |
| Once -- lifetime | 16 |
| Once -- time | 12 |
| Once and again | 14 |
| Once and for ___ | 16 |
| Once and ___ | 12 |
| Once around a track | 19 |
| Once around Sol | 15 |
| Once around the sun | 19 |
| Once before? | 12 |
| Once bitten, say | 16 |
| Once doubled | 12 |
| Once every 365 days | 19 |
| Once existed | 12 |
| Once follower | 13 |
| Once in --- moon | 16 |
| Once in a blue moon | 19 |
| Once in a blue __ | 17 |
| Once in a while | 15 |
| Once in ___ moon | 16 |
| Once it was enough | 18 |
| Once known as | 13 |
| Once menos ocho | 15 |
| Once minus tres | 15 |
| Once more than once | 19 |
| Once more, in Latin | 19 |
| Once more: Abbr. | 16 |
| Once over lightly | 17 |
| Once per annum | 14 |
| Once popular player | 19 |
| Once possessed | 14 |
| Once removed | 12 |
| Once surnamed | 13 |
| Once upon -- | 12 |
| Once upon a time | 16 |
| Once upon ___ | 13 |
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