4 letters
- roux12
- rows7
- rubs8
- rues5
- rugs7
- rule6
- ruly8
- rump11
- rums8
- runs6
- ruse5
- rush7
- rusk9
- rust5
- ruts5
- salp8
- saul6
- scop10
- scup11
- shop9
- shul8
- silo5
- slap8
- slip8
- slob8
- sloe5
- slog7
- slop8
- slot5
- slow8
- slub9
- slue6
- slug8
- slum9
- slur6
- slut6
- soap7
- soar4
- soil5
- sola5
- sold6
- sole5
- soli5
- solo5
- sols5
- soph9
- sops7
- sora4
- sorb7
- sord5
- sore4
- sori4
- sorn5
- sort4
- souk9
- soul6
- soup8
- sour5
- sous5
- spar7
- spot7
- spry9
- spud9
- spue8
- spun9
- spur8
- stop7
- suer5
- sulk10
- sulu7
- sumo8
- sump11
- supe8
- sups8
- sura5
- surd6
- sure5
- surf8
- swop10
- tolu6
- tops7
- tors4
- tour5
- trop7
- tups8
- udos6
- ulus7
- umps11
- upas8
- updo9
- upon9
- urbs8
- urds6
- urns6
- ursa5
- urus6
- user5
- wops10
- your7
- yups10