4 letters
- mure8
- murk12
- murr8
- nill7
- null8
- numb12
- nurl7
- pfui11
- pill9
- plum12
- prim10
- puli9
- pull10
- puri8
- purl9
- rail5
- rami7
- reif7
- rial5
- ribs7
- riel5
- rife7
- riff10
- rifs7
- rift7
- rile5
- rill6
- rime7
- rims7
- rimy9
- roil5
- rolf8
- roll6
- rube8
- rubs8
- ruby10
- ruff11
- ruin6
- rule6
- ruly8
- rump11
- rums8
- sill6
- slim8
- slub9
- slum9
- slur6
- surf8
- till6
- tirl5
- trim7
- turf8
- umbo11
- urbs8
- uric8
- vill10
- virl9
- will9
- yill8
- zill15