4 letters
- rums8
- rune6
- rung8
- runs6
- runt6
- ruse5
- rush7
- rusk9
- rust5
- ruts5
- ryes6
- sain5
- sane5
- sari4
- scan8
- scar7
- scop10
- scot7
- scow10
- scry9
- scud9
- scum11
- scup11
- scut8
- sear4
- secs7
- sect7
- seen5
- seep7
- seer4
- sego6
- seif7
- seis4
- semi7
- send6
- sene5
- sent5
- sept7
- sera4
- sere4
- serf7
- sers4
- sewn8
- shin7
- ship9
- shoe6
- shoo6
- shop9
- shri6
- shun8
- sice7
- sick11
- sics7
- side5
- sign7
- sike8
- silo5
- simp10
- sine5
- sing7
- sinh7
- sink9
- sins5
- sipe7
- sips7
- sire4
- sirs4
- site4
- size13
- skep11
- skin9
- skip11
- slip8
- sloe5
- slop8
- slue6
- slur6
- snap8
- sned6
- snib8
- snip8
- snit5
- snob8
- snog7
- snot5
- snow8
- snub9
- snug8
- snye7
- soap7
- soar4
- sock11
- soil5
- soke8
- sole5
- soli5
- solo5
- some7
- sone5
- song7
- sons5
- sook8
- soon5
- soot4
- soph9
- sops7
- sora4
- sorb7
- sord5
- sore4
- sori4
- sorn5
- sort4
- souk9
- soul6
- soup8
- sour5
- sous5
- sown8
- spae7
- span8
- spar7
- spec10
- sped8
- spew10
- spic10
- spik11
- spin8
- spit7
- spiv11
- spot7
- spry9
- spud9
- spue8
- spun9
- spur8
- sris4
- step7
- stir4
- stop7
- stun6
- such10
- suck12
- sued6
- suer5
- sues5
- suet5
- suit5
- sumo8
- sump11
- sung8
- sunk10
- sunn7
- suns6
- supe8
- sups8
- sura5
- surd6
- sure5
- surf8
- swop10
- syce9
- sync10
- syne7
- tens5
- tern5
- tics7
- tier4
- ties4
- tine5
- tins5
- tips7
- tire4
- tiro4
- toes4
- tone5
- tons5
- toon5
- tope7
- topi7
- tops7
- torc7
- tore4
- tori4
- torn5
- toro4
- torr4
- tors4
- tour5
- trio4
- trip7
- trop7
- true5
- tuis5
- tune6
- tuns6
- tups8
- turn6
- udos6
- ukes9