4 letters
- rubs8
- ruck12
- rude6
- rued6
- ruer5
- rues5
- rugs7
- ruin6
- rule6
- rums8
- rune6
- runs6
- ruse5
- rush7
- rusk9
- rust5
- ruts5
- ryes6
- sari4
- scar7
- scry9
- scud9
- scum11
- scup11
- scut8
- sear4
- secs7
- sect7
- seer4
- seif7
- seis4
- semi7
- sera4
- sere4
- serf7
- sers4
- shri6
- sice7
- sick11
- sics7
- side5
- sike8
- sine5
- sipe7
- sire4
- sirs4
- site4
- size13
- slue6
- slur6
- sore4
- sori4
- sour5
- spec10
- spic10
- spue8
- spur8
- sris4
- stir4
- such10
- suck12
- sued6
- suer5
- sues5
- suet5
- suit5
- supe8
- sura5
- surd6
- sure5
- surf8
- syce9
- tics7
- tier4
- ties4
- tire4
- true5
- tuis5
- ukes9
- unci9
- urbs8
- urds6
- urea5
- urge7
- uric8
- urns6
- ursa5
- urus6
- used6
- user5
- uses5
- vice11
- vier8
- vies8
- vise8
- weir7
- wire7
- wise7
- yirr6