| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Signa | 5 | 3 | 2 | 2 |
| Sign Languagea | 14 | 8 | 6 | 4 |
| Signed | 6 | 4 | 2 | 1 |
| Stamped | 7 | 5 | 2 | 2 |
| Stated | 6 | 4 | 2 | 2 |
| Substantiated | 13 | 8 | 5 | 4 |
| Sure | 4 | 2 | 2 | 1 |
| Surely | 6 | 4 | 2 | 2 |
| Sure As Shooting | 16 | 10 | 6 | 4 |
| Sure Enough | 11 | 6 | 5 | 3 |
| Sworn | 5 | 4 | 1 | 1 |
| Sworn And Affirmed | 18 | 13 | 5 | 4 |
| Sworn To | 8 | 6 | 2 | 2 |
| Tested | 6 | 4 | 2 | 2 |
| Time Tested | 11 | 7 | 4 | 4 |
| Tried | 5 | 3 | 2 | 1 |
| Tried And True | 14 | 9 | 5 | 3 |
| True | 4 | 2 | 2 | 1 |
| True As Gospel | 14 | 9 | 5 | 4 |
| Truthful | 8 | 6 | 2 | 2 |
| Unchallenged | 12 | 8 | 4 | 4 |
| Unconfuted | 10 | 6 | 4 | 4 |
| Undenied | 8 | 4 | 4 | 3 |
| Underwritten | 12 | 8 | 4 | 4 |
| Undisputed | 10 | 6 | 4 | 4 |
| Undoubted | 9 | 5 | 4 | 3 |
| Unerroneous | 11 | 5 | 6 | 5 |
| Unfallacious | 12 | 6 | 6 | 4 |
| Unfalse | 7 | 4 | 3 | 3 |
| Unmistaken | 10 | 6 | 4 | 4 |
| Unquestionable | 14 | 7 | 7 | 5 |
| Unquestioned | 12 | 6 | 6 | 3 |
| Unrefuted | 9 | 5 | 4 | 4 |
| Validated | 9 | 5 | 4 | 4 |
| Veracious | 9 | 4 | 5 | 3 |

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