| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Nuclear Warhead | 15 | 9 | 6 | 4 |
| Nuke | 4 | 2 | 2 | 1 |
| Numbfish | 8 | 6 | 2 | 2 |
| Numerosity | 10 | 6 | 4 | 5 |
| Numerousness | 12 | 7 | 5 | 4 |
| Oath | 4 | 2 | 2 | 1 |
| Obligation | 10 | 5 | 5 | 4 |
| Obstructer | 10 | 7 | 3 | 3 |
| Obstruction | 11 | 7 | 4 | 3 |
| Obstructor | 10 | 7 | 3 | 3 |
| Occupation | 10 | 5 | 5 | 4 |
| Ocean | 5 | 2 | 3 | 2 |
| Oceans | 6 | 3 | 3 | 2 |
| Oesophagus | 10 | 5 | 5 | 4 |
| Office | 6 | 3 | 3 | 2 |
| Onerous | 7 | 3 | 4 | 3 |
| Onus | 4 | 2 | 2 | 2 |
| Oodles | 6 | 3 | 3 | 2 |
| Oppress | 7 | 5 | 2 | 2 |
| Oppression | 10 | 6 | 4 | 3 |
| Outpouring | 10 | 5 | 5 | 3 |
| Overabundance | 13 | 7 | 6 | 5 |
| Overburden | 10 | 6 | 4 | 4 |
| Overeat | 7 | 3 | 4 | 3 |
| Overfill | 8 | 5 | 3 | 3 |
| Overflow | 8 | 5 | 3 | 3 |
| Overgorge | 9 | 5 | 4 | 4 |
| Overindulge | 11 | 6 | 5 | 5 |
| Overload | 8 | 4 | 4 | 3 |
| Overmuch | 8 | 5 | 3 | 3 |
| Overmuchness | 12 | 8 | 4 | 4 |
| Overplus | 8 | 5 | 3 | 3 |
| Oversupply | 10 | 7 | 3 | 4 |
| Overtax | 7 | 4 | 3 | 3 |
| Overtaxing | 10 | 6 | 4 | 4 |

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