| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Of Long Duration | 16 | 10 | 6 | 5 |
| Of Long Standing | 16 | 12 | 4 | 4 |
| Olamic | 6 | 3 | 3 | 3 |
| Perduring | 9 | 6 | 3 | 3 |
| Perennial | 9 | 5 | 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 |
| Relentless | 10 | 7 | 3 | 3 |
| Remaining | 9 | 5 | 4 | 3 |
| Roughneck | 9 | 6 | 3 | 2 |
| Rowdy | 5 | 4 | 1 | 2 |
| Ruffian | 7 | 4 | 3 | 3 |
| Sempervirent | 12 | 8 | 4 | 4 |
| Sempiternal | 11 | 7 | 4 | 4 |
| Stable | 6 | 4 | 2 | 2 |
| Stalls | 6 | 5 | 1 | 1 |
| Staunch | 7 | 5 | 2 | 1 |
| Staying | 7 | 5 | 2 | 2 |
| Steadfast | 9 | 6 | 3 | 2 |
| Steady | 6 | 4 | 2 | 2 |
| Sweetheart | 10 | 6 | 4 | 2 |
| Sweetie | 7 | 3 | 4 | 2 |
| Thomas Hardy | 12 | 9 | 3 | 4 |
| Timeless | 8 | 5 | 3 | 2 |
| Tough | 5 | 3 | 2 | 1 |
| Truelove | 8 | 4 | 4 | 2 |
| Unceasing | 9 | 5 | 4 | 3 |
| Unending | 8 | 5 | 3 | 3 |
| Unexpended | 10 | 6 | 4 | 4 |
| Unfading | 8 | 5 | 3 | 3 |
| Unintermitting | 14 | 9 | 5 | 5 |

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