| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Red | 3 | 2 | 1 | 1 |
| Restorative | 11 | 6 | 5 | 4 |
| Rigorous | 8 | 4 | 4 | 3 |
| Roborant | 8 | 5 | 3 | 3 |
| Rough | 5 | 3 | 2 | 1 |
| Roughneck | 9 | 6 | 3 | 2 |
| Rowdy | 5 | 4 | 1 | 2 |
| Ruffian | 7 | 4 | 3 | 3 |
| Rugged | 6 | 4 | 2 | 1 |
| Saturnine | 9 | 5 | 4 | 3 |
| Scalding | 8 | 6 | 2 | 2 |
| Serious | 7 | 3 | 4 | 3 |
| Severe | 6 | 3 | 3 | 2 |
| Sharp | 5 | 4 | 1 | 1 |
| Sour | 4 | 2 | 2 | 1 |
| Sourness | 8 | 5 | 3 | 2 |
| Spartan | 7 | 5 | 2 | 2 |
| Spartanic | 9 | 6 | 3 | 3 |
| Stabbing | 8 | 6 | 2 | 2 |
| Stern | 5 | 4 | 1 | 1 |
| Sting | 5 | 4 | 1 | 1 |
| Stinging | 8 | 6 | 2 | 2 |
| Strict | 6 | 5 | 1 | 1 |
| Strident | 8 | 6 | 2 | 2 |
| Stringent | 9 | 7 | 2 | 2 |
| Styptic | 7 | 6 | 1 | 2 |
| Styptic Pencil | 14 | 11 | 3 | 4 |
| Sulfurous | 9 | 5 | 4 | 3 |
| Sullen | 6 | 4 | 2 | 2 |
| Sulphurous | 10 | 6 | 4 | 3 |
| Superman | 8 | 5 | 3 | 3 |
| Tail | 4 | 2 | 2 | 1 |
| Tart | 4 | 3 | 1 | 1 |
| Tearing | 7 | 4 | 3 | 2 |
| Teasing | 7 | 4 | 3 | 2 |

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