4 letters
- sera4
- sere4
- serf7
- sers4
- sets4
- sews7
- shes6
- shul8
- sibs7
- sims7
- sire4
- sirs4
- slab8
- slam8
- sled6
- slew8
- slim8
- slob8
- sloe5
- slub9
- slue6
- slug8
- slum9
- slur6
- slut6
- smew10
- smug10
- smut8
- snub9
- sobs7
- sole5
- sols5
- some7
- sorb7
- sore4
- soul6
- sour5
- sous5
- spue8
- spur8
- sris4
- stem7
- stub8
- stum8
- suba8
- subs8
- suds6
- sued6
- suer5
- sues5
- suet5
- sulk10
- sulu7
- sumo8
- sump11
- sums8
- suns6
- supe8
- sups8
- suqs14
- sura5
- surd6
- sure5
- surf8
- suss5
- swum11
- tels5
- term7
- true5
- tube8
- tubs8
- tule6
- ukes9
- ulus7
- umbo11
- umps11
- unbe9
- urbs8
- urds6
- urea5
- urge7
- urns6
- ursa5
- urus6
- used6
- user5
- uses5
- verb11
- webs10
- wuss8
- ylem10
- yule8
- zebu17