4 letters
- rugs7
- ruin6
- rums8
- runs6
- ruse5
- rush7
- rusk9
- rust5
- ruth7
- ruts5
- sari4
- seif7
- serf7
- shim9
- shin7
- ship9
- shit6
- shiv10
- shri6
- shul8
- shun8
- shut7
- sibb10
- sibs7
- sift7
- sigh8
- sinh7
- sire4
- sirs4
- sith6
- slub9
- slur6
- snib8
- snub9
- sorb7
- sori4
- sour5
- spur8
- sris4
- stir4
- stub8
- suba8
- subs8
- such10
- suer5
- sugh9
- suit5
- sura5
- surd6
- sure5
- surf8
- thir6
- this6
- thru7
- thus7
- tubs8
- tuis5
- turf8
- tush7
- ughs9
- urbs8
- urds6
- uric8
- urns6
- ursa5
- urus6
- user5
- whir9
- wish9