4 letters
- rely7
- rice7
- riel5
- rile5
- rill6
- robe7
- role5
- roll6
- roue5
- rube8
- rubs8
- ruby10
- ruck12
- rude6
- rued6
- ruer5
- rues5
- rule6
- ruly8
- rune6
- ruse5
- sell6
- slew8
- slub9
- slue6
- slur6
- suer5
- sure5
- tell6
- true5
- tube8
- tule6
- unbe9
- urbs8
- urea5
- urge7
- uric8
- user5
- verb11
- wale8
- wall9
- ware7
- waul9
- waur8
- weal8
- wear7
- webs10
- weel8
- weer7
- weir7
- weld9
- well9
- welt8
- were7
- wert7
- wile8
- will9
- wire7
- wore7
- wren8
- wyle10
- yell8
- yule8
- zebu17