4 letters
- sign7
- sine5
- sing7
- sinh7
- sink9
- sins5
- sire4
- sirs4
- skin9
- slub9
- slur6
- snib8
- snip8
- snit5
- snob8
- snub9
- snug8
- sorb7
- sori4
- sorn5
- sour5
- spin8
- spun9
- spur8
- sris4
- stir4
- stub8
- stun6
- suba8
- subs8
- suer5
- suit5
- sung8
- sunk10
- sunn7
- suns6
- sura5
- surd6
- sure5
- surf8
- tins5
- tubs8
- tuis5
- tuns6
- turn6
- unai6
- unbe9
- unci9
- unit6
- urbs8
- urds6
- uric8
- urns6
- ursa5
- urus6
- user5
- wins8
- yins7
- zins14