4 letters
- rune6
- runs6
- ruse5
- rush7
- rusk9
- rust5
- ruts5
- ryes6
- scup11
- sear4
- seed5
- seek8
- seel5
- seem7
- seen5
- seep7
- seer4
- sees4
- seme7
- sene5
- sept7
- sera4
- sere4
- serf7
- sers4
- sipe7
- sire4
- skee8
- skep11
- slue6
- slur6
- sore4
- soup8
- sour5
- spae7
- spar7
- spec10
- sped8
- spew10
- spry9
- spud9
- spue8
- spun9
- spur8
- step7
- sued6
- suer5
- sues5
- suet5
- sump11
- supe8
- sups8
- sura5
- surd6
- sure5
- surf8
- tees4
- tree4
- true5
- tups8
- ukes9
- umps11
- upas8
- urbs8
- urds6
- urea5
- urge7
- urns6
- ursa5
- urus6
- used6
- user5
- uses5
- veep11
- veer8
- vees8
- weep10
- weer7
- wees7
- were7
- yups10
- zees13