4 letters
- pirn8
- plug11
- plum12
- prig9
- prim10
- puli9
- pung11
- puri8
- purl9
- quin15
- ragi6
- rail5
- rain5
- rami7
- rang7
- rani5
- rein5
- rial5
- riel5
- rigs6
- rile5
- rill6
- rime7
- rims7
- rimy9
- rind6
- ring7
- rink9
- rins5
- roil5
- ruga7
- rugs7
- ruin6
- rule6
- ruly8
- rump11
- rums8
- rune6
- rung8
- runs6
- runt6
- sign7
- sing7
- slim8
- slug8
- slum9
- slur6
- smug10
- snug8
- sung8
- ting7
- tirl5
- trig6
- trim7
- trug7
- tung8
- turn6
- ugly10
- ulan7
- ulna7
- unai6
- unci9
- unit6
- urge7
- uric8
- urns6
- virl9
- wing10
- zing16