| Text | Length |
| Ontario or Michigan | 19 |
| Ontario Port | 12 |
| Ontario Premier | 15 |
| Ontario Premier Bob | 19 |
| Ontario raceway | 15 |
| Ontario river | 13 |
| Ontario sports org. | 19 |
| Ontario town | 12 |
| Ontario tribe | 13 |
| Ontario tribesmen | 17 |
| Ontario TV network | 18 |
| Ontario valley | 14 |
| Ontario village | 15 |
| Ontario's bird | 18 |
| Ontario's tree | 18 |
| Ontario, abbr. | 14 |
| Ontario, e.g. | 13 |
| Ontario, for one | 16 |
| Ontario-Huron link | 18 |
| Onto the beach | 14 |
| Onto the jive | 13 |
| Onto the sand | 13 |
| Onto, in jive talk | 18 |
| Onward in time | 14 |
| Onward, in Naples | 17 |
| Onyx and ebony | 14 |
| Onyx and opal | 13 |
| Onyx features | 13 |
| Onyx or amethyst | 16 |
| Onyx or opal | 12 |
| Onyx relative | 13 |
| Onyx-like minerals | 18 |
| Onyxes and opals | 16 |
| On_____(precisely) | 18 |
| OO7 Author Fleming | 18 |
| Oobleck, e.g. | 13 |
| Oocytes, eventually | 19 |
| Oodles and oodles | 17 |
| Oodles of dough | 15 |
| Oodles of ounces | 16 |
| Oodles of oz. | 13 |
| Oodles of pounds | 16 |
| Oodles of time | 14 |
| Oodles; gobs | 12 |
| Oogenesis product | 17 |
| Ooh and aah, e.g. | 17 |
| Ooh and aah, say | 16 |
| Ooh and ah producer | 19 |
| Ooh! that smarts | 16 |
| Ooh's partner | 17 |
| Oohed and -- | 12 |
| Oohed and __ | 12 |
| Oohed and ___ | 13 |
| Oohed and ____ | 14 |
| Oohed partner | 13 |
| Oohing cause | 12 |
| Oohs and aahs | 13 |
| Oohs and ___ | 12 |
| Oohs companions | 15 |
| Oohs' mates | 15 |
| Oohs' partners | 18 |
| Oola and Alley | 14 |
| Oola's Alley | 16 |
| Oolong alternative | 18 |
| Oolong and green | 16 |
| Oolong and hyson | 16 |
| Oolong and oopak | 16 |
| Oolong and others | 17 |
| Oolong and pekoe | 16 |
| Oolong and souchong | 19 |
| Oolong brewer | 13 |
| Oolong brewers | 14 |
| Oolong et al. | 13 |
| Oolong or bohea | 15 |
| Oolong or Earl Grey | 19 |
| Oolong or pekoe | 15 |
| Oolong or souchong | 18 |
| Oolong steeper | 14 |
| Oolong tea exporter | 19 |
| Oolong, e.g. | 12 |
| Oolong, for one | 15 |
| Oolong, pekoe, etc. | 19 |
| Oom for one | 12 |
| Oom follower | 12 |
| Oom Paul was one | 16 |
| Oom Paul, e.g. | 14 |
| Oom- -- band | 12 |
| Oom-pah makers | 14 |
| Oom-pah-pah-er | 14 |
| Oom-pah-paher | 13 |
| Oom-___ band | 12 |
| Oompah band member | 18 |
| Oompah band tune | 16 |
| Oompah brass | 12 |
| Oompah instrument | 17 |
| Oompah instruments | 18 |
| Oompah maker | 12 |
| Oompah producer | 15 |
| Oompah- ____ | 12 |
| Oompah-band tune | 16 |
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