4 letters
- slip8
- slum9
- slur6
- smit7
- smug10
- smut8
- snip8
- sori4
- soup8
- sour5
- spam10
- spar7
- spic10
- spik11
- spin8
- spit7
- spiv11
- spry9
- spud9
- spue8
- spun9
- spur8
- sris4
- stir4
- stum8
- suer5
- suit5
- sumo8
- sump11
- sums8
- supe8
- sups8
- sura5
- surd6
- sure5
- surf8
- swim10
- swum11
- tips7
- trim7
- trip7
- tuis5
- tump11
- tups8
- umps11
- upas8
- urbs8
- urds6
- uric8
- urns6
- ursa5
- urus6
- user5
- vims11
- wimp13
- wisp10
- yips9
- yups10
- zips16