4 letters
- rats4
- raws7
- rays6
- rebs7
- rhus7
- rias4
- ribs7
- risk8
- robs7
- rube8
- rubs8
- ruby10
- ruck12
- rues5
- ruga7
- rugs7
- rums8
- runs6
- ruse5
- rush7
- rusk9
- rust5
- ruts5
- ryas6
- sabe7
- sabs7
- sack11
- sake8
- saki8
- sank9
- sard5
- sari4
- sark8
- saul6
- scab10
- scar7
- sear4
- sera4
- skag10
- skas8
- skat8
- skua9
- slab8
- slub9
- slur6
- snub9
- soak8
- soar4
- sora4
- sorb7
- souk9
- sour5
- spar7
- spur8
- stab7
- star4
- stub8
- suba8
- subs8
- suck12
- suer5
- sulk10
- sunk10
- sura5
- surd6
- sure5
- surf8
- swab10
- tabs7
- tabu8
- tars4
- task8
- taus5
- tsar4
- tuba8
- tubs8
- turk9
- tusk9
- ukes9
- upas8
- urbs8
- urds6
- urea5
- urns6
- ursa5
- urus6
- user5
- utas5
- vars8
- vaus9
- wabs10
- wark11
- wars7
- wauk12
- waur8
- yaks10
- yuks11