4 letters
- sibb10
- sibs7
- sigh8
- sima7
- sinh7
- sire4
- sirs4
- sith6
- skua9
- slab8
- slub9
- slur6
- snib8
- snub9
- soar4
- sora4
- sorb7
- sori4
- sour5
- spar7
- spur8
- sris4
- stab7
- star4
- stir4
- stub8
- suba8
- subs8
- such10
- suer5
- sugh9
- suit5
- sura5
- surd6
- sure5
- surf8
- swab10
- tabs7
- tabu8
- tahr6
- tars4
- taus5
- thir6
- this6
- thru7
- thus7
- tsar4
- tuba8
- tubs8
- tuis5
- tush7
- ughs9
- unai6
- upas8
- urbs8
- urds6
- urea5
- uric8
- urns6
- ursa5
- urus6
- user5
- utas5
- vair8
- vars8
- vaus9
- visa8
- wabs10
- wair7
- wars7
- wash9
- waur8
- whir9
- wish9
- yirr6