4 letters
- rani5
- rank9
- rant5
- raps7
- rase4
- rash6
- rasp7
- rats4
- raws7
- rays6
- rebs7
- rias4
- ribs7
- rink9
- rins5
- risk8
- roan5
- robs7
- rubs8
- runs6
- rusk9
- ryas6
- sabe7
- sabs7
- sack11
- sain5
- sake8
- saki8
- sand6
- sane5
- sang7
- sank9
- sans5
- sard5
- sari4
- sark8
- sawn8
- scab10
- scan8
- scar7
- sear4
- sera4
- sink9
- skag10
- skas8
- skat8
- skin9
- skua9
- slab8
- snag7
- snap8
- snaw8
- snib8
- snob8
- snub9
- soak8
- soar4
- sora4
- sorb7
- sorn5
- span8
- spar7
- stab7
- star4
- suba8
- sunk10
- sura5
- swab10
- swan8
- tabs7
- tank9
- tans5
- tarn5
- tars4
- task8
- tsar4
- urbs8
- urns6
- ursa5
- vans9
- vars8
- wabs10
- wans8
- wark11
- warn8
- wars7
- yaks10
- yank11
- yarn7