4 letters
- neif8
- ogre6
- peri7
- pfui11
- pier7
- prig9
- pure8
- puri8
- rage6
- ragi6
- rebs7
- reef7
- refs7
- reft7
- regs6
- reif7
- rein5
- reis4
- ribs7
- rice7
- ride5
- riel5
- rife7
- riff10
- rifs7
- rift7
- rigs6
- rile5
- rime7
- ring7
- ripe7
- rise4
- rite4
- rive8
- robe7
- roue5
- rube8
- rubs8
- ruby10
- rude6
- rued6
- ruer5
- rues5
- ruff11
- ruga7
- rugs7
- ruin6
- rule6
- rune6
- rung8
- ruse5
- seif7
- serf7
- sire4
- suer5
- sure5
- surf8
- tier4
- tire4
- tref7
- trig6
- true5
- trug7
- tube8
- turf8
- unbe9
- urbs8
- urea5
- urge7
- uric8
- user5
- verb11
- vibe11
- vier8
- weir7
- wife10
- wire7
- zebu17