4 letters
- rune6
- runs6
- ruse5
- rush7
- rusk9
- rust5
- ruth7
- ruts5
- ryes6
- sari4
- sear4
- seer4
- seif7
- seis4
- semi7
- sera4
- sere4
- serf7
- sers4
- shah8
- shea6
- shed7
- shes6
- shew9
- shim9
- shin7
- ship9
- shit6
- shiv10
- shoe6
- shri6
- shul8
- shun8
- shut7
- sice7
- side5
- sigh8
- sike8
- sine5
- sinh7
- sipe7
- sire4
- sirs4
- site4
- sith6
- size13
- slue6
- slur6
- sore4
- sori4
- sour5
- spue8
- spur8
- sris4
- stir4
- such10
- sued6
- suer5
- sues5
- suet5
- sugh9
- suit5
- supe8
- sura5
- surd6
- sure5
- surf8
- thir6
- this6
- thru7
- thus7
- tier4
- ties4
- tire4
- true5
- tuis5
- tush7
- ughs9
- ukes9
- urbs8
- urds6
- urea5
- urge7
- uric8
- urns6
- ursa5
- urus6
- used6
- user5
- uses5
- vier8
- vies8
- vise8
- weir7
- whir9
- wire7
- wise7
- wish9