| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Multifariousness | 16 | 9 | 7 | 6 |
| Mustela Erminea | 15 | 8 | 7 | 5 |
| Mutability | 10 | 6 | 4 | 5 |
| Mutableness | 11 | 7 | 4 | 4 |
| Nature | 6 | 3 | 3 | 2 |
| Negation | 8 | 4 | 4 | 3 |
| Net | 3 | 2 | 1 | 1 |
| Nimiety | 7 | 4 | 3 | 4 |
| Nombril Point | 13 | 9 | 4 | 3 |
| Nonagreement | 12 | 7 | 5 | 4 |
| Nonconcurrence | 14 | 9 | 5 | 4 |
| Nonconformism | 13 | 9 | 4 | 5 |
| Nonconformity | 13 | 9 | 4 | 5 |
| Nonconsent | 10 | 7 | 3 | 3 |
| Nonstandardization | 18 | 11 | 7 | 6 |
| Nonuniformity | 13 | 8 | 5 | 6 |
| Number | 6 | 4 | 2 | 2 |
| Numeration | 10 | 5 | 5 | 4 |
| Objection | 9 | 5 | 4 | 3 |
| Octofoil | 8 | 4 | 4 | 3 |
| Oddity | 6 | 4 | 2 | 3 |
| Oddment | 7 | 5 | 2 | 2 |
| Odds | 4 | 3 | 1 | 1 |
| Office | 6 | 3 | 3 | 2 |
| Operating Room | 14 | 8 | 6 | 5 |
| Operating Theater | 17 | 10 | 7 | 6 |
| Operating Theatre | 17 | 10 | 7 | 6 |
| Opposition | 10 | 5 | 5 | 4 |
| Oppugnancy | 10 | 7 | 3 | 4 |
| Optical Aberration | 18 | 10 | 8 | 7 |
| OR | 2 | 1 | 1 | 1 |
| Ordinary | 8 | 5 | 3 | 4 |
| Orle | 4 | 2 | 2 | 2 |
| Otherness | 9 | 6 | 3 | 3 |
| Overbalance | 11 | 6 | 5 | 4 |

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