| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Nettlesome | 10 | 6 | 4 | 3 |
| Never Ending | 12 | 8 | 4 | 4 |
| Never Say Die | 13 | 8 | 5 | 4 |
| Never Ending | 12 | 8 | 4 | 4 |
| Never Tiring | 12 | 8 | 4 | 4 |
| Nonstop | 7 | 5 | 2 | 2 |
| Nonstop Flight | 14 | 11 | 3 | 3 |
| Obsessed | 8 | 5 | 3 | 1 |
| Obstinate | 9 | 5 | 4 | 3 |
| Obtrusive | 9 | 5 | 4 | 3 |
| Oil Production | 14 | 8 | 6 | 4 |
| Old Hat | 7 | 5 | 2 | 2 |
| Onerous | 7 | 3 | 4 | 3 |
| Onomatopoeic | 12 | 5 | 7 | 6 |
| Onomatopoeical | 14 | 6 | 8 | 7 |
| Onomatopoetic | 13 | 6 | 7 | 6 |
| Open | 4 | 2 | 2 | 2 |
| Orchestrate | 11 | 7 | 4 | 3 |
| Organise | 8 | 4 | 4 | 3 |
| Organize | 8 | 4 | 4 | 3 |
| Outrageous | 10 | 4 | 6 | 3 |
| Overflowing | 11 | 7 | 4 | 4 |
| Overweening | 11 | 6 | 5 | 4 |
| Parrotlike | 10 | 6 | 4 | 3 |
| Patient | 7 | 4 | 3 | 3 |
| Patient As Job | 14 | 9 | 5 | 5 |
| Patient Role | 12 | 7 | 5 | 4 |
| Perennial | 9 | 5 | 4 | 4 |
| Periodic | 8 | 4 | 4 | 4 |
| Perm | 4 | 3 | 1 | 1 |
| Permanent | 9 | 6 | 3 | 3 |
| Permanent Wave | 14 | 9 | 5 | 4 |
| Perpetual | 9 | 5 | 4 | 4 |
| Persistent | 10 | 7 | 3 | 3 |
| Persisting | 10 | 7 | 3 | 3 |

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