4 letters
- rash6
- rasp7
- rath6
- rats4
- raws7
- rays6
- ream7
- rear4
- rems7
- resh6
- rhea6
- rhos6
- rhus7
- rias4
- rims7
- roam7
- roar4
- roms7
- rubs8
- ruer5
- rues5
- ruga7
- rugs7
- rump11
- rums8
- runs6
- ruse5
- rush7
- rusk9
- rust5
- ruth7
- ruts5
- ryas6
- same7
- samp10
- sard5
- sari4
- sark8
- sash6
- saul6
- scam10
- scar7
- scum11
- seam7
- sear4
- sera4
- shad7
- shag8
- shah8
- sham9
- shat6
- shaw9
- shay8
- shea6
- shim9
- shmo9
- shri6
- shul8
- shun8
- shut7
- sima7
- skua9
- slam8
- slum9
- slur6
- smug10
- smut8
- soar4
- soma7
- sora4
- sour5
- spam10
- spar7
- spur8
- star4
- stum8
- suba8
- such10
- suer5
- sugh9
- sumo8
- sump11
- sums8
- sura5
- surd6
- sure5
- surf8
- swam10
- swum11
- tahr6
- tams7
- tars4
- taus5
- thru7
- thus7
- tram7
- tsar4
- tush7
- ughs9
- umps11
- upas8
- urbs8
- urds6
- urea5
- urns6
- ursa5
- urus6
- user5
- utas5
- vars8
- vaus9
- warm10
- wars7
- wash9
- waur8
- wham12
- yams9