4 letters
- some7
- sorb7
- sore4
- soul6
- sour5
- spue8
- spur8
- stem7
- stub8
- stum8
- suba8
- subs8
- sued6
- suer5
- sues5
- suet5
- sulk10
- sulu7
- sumo8
- sump11
- sums8
- supe8
- sura5
- surd6
- sure5
- surf8
- swum11
- tels5
- term7
- true5
- tube8
- tubs8
- tule6
- ukes9
- ulus7
- umbo11
- umps11
- unbe9
- urbs8
- urds6
- urea5
- urge7
- urns6
- ursa5
- urus6
- used6
- user5
- uses5
- verb11
- webs10
- ylem10
- yule8
- zebu17