4 letters
- sorn5
- sour5
- sped8
- spud9
- spue8
- spun9
- spur8
- stub8
- stud6
- stun6
- suba8
- subs8
- sudd7
- suds6
- sued6
- suer5
- sues5
- suet5
- sung8
- sunk10
- sunn7
- suns6
- supe8
- sura5
- surd6
- sure5
- surf8
- syne7
- teds5
- tend6
- tens5
- tern5
- true5
- tube8
- tubs8
- tune6
- tuns6
- turd6
- turn6
- udos6
- ukes9
- unbe9
- unde7
- undo7
- undy9
- urbs8
- urds6
- urea5
- urge7
- urns6
- ursa5
- urus6
- used6
- user5
- uses5
- vend10
- verb11
- webs10
- weds8
- wend9
- wens8
- wren8
- yens7
- zebu17
- zeds14