4 letters
- regs6
- reis4
- rems7
- rend6
- reps7
- resh6
- rest4
- rets4
- revs8
- rhus7
- rice7
- ride5
- rids5
- rise4
- rocs7
- rode5
- rods5
- roes4
- rose4
- roue5
- rube8
- rubs8
- ruck12
- rudd7
- rude6
- rued6
- ruer5
- rues5
- rugs7
- rule6
- rums8
- rune6
- runs6
- ruse5
- rush7
- rusk9
- rust5
- ruts5
- ryes6
- sade5
- sard5
- scad8
- scar7
- scry9
- scud9
- scum11
- scup11
- scut8
- sear4
- secs7
- sect7
- seed5
- seer4
- send6
- sera4
- sere4
- serf7
- sers4
- shed7
- sice7
- side5
- sire4
- sled6
- slue6
- slur6
- sned6
- sord5
- sore4
- sour5
- spec10
- sped8
- spud9
- spue8
- spur8
- stud6
- such10
- suck12
- sudd7
- suds6
- sued6
- suer5
- sues5
- suet5
- supe8
- sura5
- surd6
- sure5
- surf8
- syce9
- teds5
- true5
- turd6
- udos6
- ukes9
- unde7
- urbs8
- urds6
- urea5
- urge7
- uric8
- urns6
- ursa5
- urus6
- used6
- user5
- uses5
- weds8
- zeds14