4 letters
- slug8
- slum9
- slur6
- slut6
- sole5
- sols5
- sops7
- sore4
- soul6
- soup8
- sour5
- sous5
- spae7
- spar7
- spas7
- spec10
- sped8
- spew10
- spry9
- spud9
- spue8
- spun9
- spur8
- sris4
- step7
- subs8
- suds6
- sued6
- suer5
- sues5
- suet5
- sulk10
- sulu7
- sump11
- sums8
- suns6
- supe8
- sups8
- suqs14
- sura5
- surd6
- sure5
- surf8
- suss5
- teel5
- tees4
- tele5
- tels5
- tree4
- true5
- tule6
- tups8
- ukes9
- ulus7
- umps11
- upas8
- urbs8
- urds6
- urea5
- urge7
- urns6
- ursa5
- urus6
- used6
- user5
- uses5
- veep11
- veer8
- vees8
- weel8
- weep10
- weer7
- wees7
- were7
- wuss8
- yelp10
- yule8
- yups10
- zees13