4 letters
- rusk9
- rust5
- ruth7
- ruts5
- ryes6
- sabe7
- sane5
- scab10
- scan8
- scar7
- scry9
- scud9
- scum11
- scup11
- scut8
- sear4
- secs7
- sect7
- seen5
- seer4
- send6
- sene5
- sent5
- sera4
- sere4
- serf7
- sers4
- sewn8
- shea6
- shed7
- shes6
- shew9
- shin7
- shoe6
- shri6
- shul8
- shun8
- shut7
- sice7
- sine5
- sinh7
- sire4
- slub9
- slue6
- slur6
- sned6
- snib8
- snob8
- snub9
- snug8
- snye7
- sone5
- sorb7
- sore4
- sorn5
- sour5
- spec10
- spue8
- spun9
- spur8
- stub8
- stun6
- suba8
- subs8
- such10
- suck12
- sued6
- suer5
- sues5
- suet5
- sugh9
- sung8
- sunk10
- sunn7
- suns6
- supe8
- sura5
- surd6
- sure5
- surf8
- syce9
- sync10
- syne7
- tens5
- tern5
- then7
- thru7
- thus7
- true5
- tube8
- tubs8
- tune6
- tuns6
- turn6
- tush7
- ughs9
- ukes9
- unbe9
- unci9
- unco9
- unde7
- urbs8
- urds6
- urea5
- urge7
- uric8
- urns6
- ursa5
- urus6
- used6
- user5
- uses5
- verb11
- webs10
- wens8
- when10
- wren8
- yech11
- yens7
- yuch12
- zebu17