4 letters
- runs6
- ruse5
- rush7
- rusk9
- rust5
- ruts5
- scar7
- scop10
- scot7
- scow10
- scry9
- scud9
- scum11
- scup11
- scut8
- shop9
- slop8
- slur6
- soap7
- soar4
- sock11
- soph9
- sops7
- sora4
- sorb7
- sord5
- sore4
- sori4
- sorn5
- sort4
- souk9
- soul6
- soup8
- sour5
- sous5
- spar7
- spec10
- spic10
- spot7
- spry9
- spud9
- spue8
- spun9
- spur8
- stop7
- such10
- suck12
- suer5
- sumo8
- sump11
- supe8
- sups8
- sura5
- surd6
- sure5
- surf8
- swop10
- tops7
- torc7
- tors4
- tour5
- trop7
- tups8
- udos6
- umps11
- unco9
- upas8
- updo9
- upon9
- urbs8
- urds6
- uric8
- urns6
- ursa5
- urus6
- user5
- wops10
- your7
- yups10