4 letters
- push10
- puss8
- puts8
- raps7
- rasp7
- recs7
- repo7
- reps7
- rhos6
- rhus7
- rips7
- robs7
- rock11
- rocs7
- rods5
- roes4
- romp10
- roms7
- rood5
- roof7
- rook8
- room7
- root4
- rope7
- ropy9
- rose4
- rosy6
- roto4
- rots4
- roue5
- roup8
- rout5
- roux12
- rows7
- rubs8
- ruck12
- rues5
- rugs7
- rump11
- rums8
- runs6
- ruse5
- rush7
- rusk9
- rust5
- ruts5
- scar7
- scop10
- scot7
- scow10
- scry9
- scud9
- scum11
- scup11
- scut8
- shoo6
- shop9
- slop8
- slur6
- soap7
- soar4
- sock11
- solo5
- sook8
- soon5
- soot4
- soph9
- sops7
- sora4
- sorb7
- sord5
- sore4
- sori4
- sorn5
- sort4
- souk9
- soul6
- soup8
- sour5
- sous5
- spar7
- spec10
- spic10
- spot7
- spry9
- spud9
- spue8
- spun9
- spur8
- stop7
- such10
- suck12
- suer5
- sulu7
- sumo8
- sump11
- supe8
- sups8
- sura5
- surd6
- sure5
- surf8
- swop10
- tops7
- torc7
- toro4
- tors4
- tour5
- trop7
- tups8
- udos6
- ulus7
- umps11
- unco9
- upas8
- updo9
- upon9
- urbs8
- urds6
- uric8
- urns6
- ursa5
- urus6
- user5
- woos7
- wops10
- your7
- yups10
- zoos13