4 letters
- paca10
- para7
- plan9
- prau8
- pula9
- puna9
- purl9
- race7
- rack11
- racy9
- raga6
- raia4
- rail5
- rain5
- raja13
- rale5
- rand6
- rang7
- rani5
- rank9
- rant5
- raya6
- real5
- rial5
- roan5
- ruck12
- ruga7
- ruin6
- rule6
- ruly8
- rune6
- rung8
- runs6
- runt6
- saul6
- scan8
- scar7
- slur6
- sura5
- tala5
- talc8
- tarn5
- tuna6
- turn6
- ulan7
- ulna7
- ulva10
- unai6
- unau7
- unci9
- unco9
- urea5
- uric8
- urns6
- ursa5
- vara8
- warn8
- waul9
- waur8
- yarn7
- yuan8
- yuca10