4 letters
- rick11
- risk8
- rock11
- rocs7
- rubs8
- ruck12
- rues5
- ruga7
- rugs7
- rums8
- runs6
- ruse5
- rush7
- rusk9
- rust5
- ruts5
- ryas6
- sack11
- sacs7
- sake8
- saki8
- sank9
- sard5
- sari4
- sark8
- saul6
- scab10
- scad8
- scag9
- scam10
- scan8
- scar7
- scat7
- scry9
- scud9
- scum11
- scup11
- scut8
- sear4
- sera4
- sick11
- skag10
- skas8
- skat8
- skua9
- slur6
- soak8
- soar4
- sock11
- sora4
- souk9
- sour5
- spar7
- spur8
- star4
- suba8
- such10
- suck12
- suer5
- sulk10
- sunk10
- sura5
- surd6
- sure5
- surf8
- tack11
- tars4
- task8
- taus5
- tsar4
- tuck12
- turk9
- tusk9
- ukes9
- upas8
- urbs8
- urds6
- urea5
- uric8
- urns6
- ursa5
- urus6
- user5
- utas5
- vacs11
- vars8
- vaus9
- wack14
- wark11
- wars7
- wauk12
- waur8
- yack13
- yaks10
- yuca10
- yuck14
- yuks11