4 letters
- numb12
- nuns7
- nurd7
- nurl7
- nuts6
- obis7
- onus6
- orbs7
- orcs7
- ours5
- pics10
- pins8
- pirn8
- pubs11
- puns9
- puri8
- purs8
- quin15
- rain5
- rani5
- rebs7
- recs7
- rein5
- reis4
- rhus7
- rias4
- ribs7
- rice7
- rich9
- rick11
- rids5
- rifs7
- rigs6
- rims7
- rind6
- ring7
- rink9
- rins5
- rips7
- rise4
- risk8
- robs7
- rocs7
- rube8
- rubs8
- ruby10
- ruck12
- rues5
- rugs7
- ruin6
- rums8
- rune6
- rung8
- runs6
- runt6
- ruse5
- rush7
- rusk9
- rust5
- ruts5
- sain5
- sari4
- scab10
- scan8
- scar7
- scry9
- scud9
- scum11
- scup11
- scut8
- shin7
- shri6
- shun8
- sibb10
- sibs7
- sice7
- sick11
- sics7
- sign7
- sine5
- sing7
- sinh7
- sink9
- sins5
- sire4
- sirs4
- skin9
- slub9
- slur6
- snib8
- snip8
- snit5
- snob8
- snub9
- snug8
- sorb7
- sori4
- sorn5
- sour5
- spic10
- spin8
- spun9
- spur8
- sris4
- stir4
- stub8
- stun6
- suba8
- subs8
- such10
- suck12
- suer5
- suit5
- sung8
- sunk10
- sunn7
- suns6
- sura5
- surd6
- sure5
- surf8
- sync10
- tics7
- tins5
- tubs8
- tuis5
- tuns6
- turn6
- unai6
- unbe9
- unci9
- unco9
- unit6
- urbs8
- urds6
- uric8
- urns6
- ursa5
- urus6
- user5
- wins8
- yins7
- zinc17
- zins14