4 letters
- merl8
- mule9
- mure8
- muse8
- nebs8
- nubs9
- nurl7
- obes7
- oles5
- orbs7
- ores4
- orle5
- ours5
- pleb11
- plus9
- pubs11
- pule9
- puls9
- pure8
- purl9
- purs8
- rale5
- rase4
- real5
- rebs7
- recs7
- reds5
- reel5
- rees4
- refs7
- regs6
- reis4
- rely7
- rems7
- reps7
- resh6
- rest4
- rets4
- revs8
- rhus7
- ribs7
- riel5
- rile5
- rise4
- robe7
- robs7
- roes4
- role5
- rose4
- roue5
- rube8
- rubs8
- ruby10
- rude6
- rued6
- ruer5
- rues5
- rugs7
- rule6
- ruly8
- rums8
- rune6
- runs6
- ruse5
- rush7
- rusk9
- rust5
- ruts5
- ryes6
- sabe7
- sale5
- saul6
- seal5
- sear4
- seel5
- seer4
- self8
- sell6
- sels5
- sera4
- sere4
- serf7
- sers4
- shul8
- sibb10
- sire4
- slab8
- sled6
- slew8
- slob8
- sloe5
- slub9
- slue6
- slug8
- slum9
- slur6
- slut6
- snub9
- sole5
- sorb7
- sore4
- soul6
- sour5
- spue8
- spur8
- stub8
- suba8
- subs8
- sued6
- suer5
- sues5
- suet5
- sulk10
- sulu7
- supe8
- sura5
- surd6
- sure5
- surf8
- tels5
- true5
- tube8
- tubs8
- tule6
- ukes9
- ulus7
- unbe9
- urbs8
- urds6
- urea5
- urge7
- urns6
- ursa5
- urus6
- used6
- user5
- uses5
- verb11
- webs10
- yule8
- zebu17