4 letters
- rice7
- rich9
- rick11
- riel5
- rigs6
- rile5
- rill6
- rime7
- rims7
- rimy9
- rind6
- ring7
- rink9
- rins5
- ripe7
- rips7
- roil5
- romp10
- roup8
- ruck12
- ruga7
- rugs7
- ruin6
- rule6
- ruly8
- rump11
- rums8
- rune6
- rung8
- runs6
- runt6
- scum11
- scup11
- sign7
- simp10
- sing7
- slim8
- slip8
- slug8
- slum9
- slur6
- smug10
- snip8
- snug8
- spic10
- spin8
- spun9
- spur8
- sulu7
- sump11
- sung8
- sunn7
- ting7
- tirl5
- trig6
- trim7
- trip7
- trug7
- tump11
- tung8
- turn6
- ugly10
- ulan7
- ulna7
- ulus7
- umps11
- unai6
- unau7
- unci9
- unco9
- unit6
- upon9
- urge7
- uric8
- urns6
- urus6
- virl9
- wimp13
- wing10
- zinc17
- zing16