4 letters
- mirs7
- muds9
- murr8
- nibs8
- nubs9
- nurd7
- obis7
- orbs7
- ouds6
- ours5
- pfui11
- pubs11
- puds9
- puri8
- purr8
- purs8
- quid15
- rads5
- raid5
- rebs7
- reds5
- refs7
- reif7
- reis4
- rhus7
- rias4
- ribs7
- ride5
- rids5
- rife7
- riff10
- rifs7
- rift7
- rigs6
- rims7
- rind6
- rins5
- rips7
- rise4
- risk8
- robs7
- rods5
- rube8
- rubs8
- ruby10
- rudd7
- rude6
- rued6
- ruer5
- rues5
- ruff11
- rugs7
- ruin6
- rums8
- runs6
- ruse5
- rush7
- rusk9
- rust5
- ruts5
- sadi5
- said5
- sard5
- sari4
- scud9
- seif7
- serf7
- shri6
- sibb10
- sibs7
- side5
- sift7
- sild6
- sire4
- sirs4
- skid9
- slid6
- slub9
- slur6
- snib8
- snub9
- sorb7
- sord5
- sori4
- sour5
- spud9
- spur8
- sris4
- stir4
- stub8
- stud6
- suba8
- subs8
- sudd7
- suds6
- sued6
- suer5
- suit5
- sura5
- surd6
- sure5
- surf8
- tubs8
- tuis5
- turd6
- turf8
- udos6
- urbs8
- urds6
- uric8
- urns6
- ursa5
- urus6
- used6
- user5
- yids7
- yird7
- yirr6