5 letters
- ruers6
- ruffe12
- ruffs12
- ruins7
- rules7
- rumen10
- rumps12
- runes7
- rungs9
- runts7
- ruses6
- safer8
- saner6
- scrum12
- scurf12
- sebum12
- sedum10
- semen9
- senor6
- serfs8
- serif8
- serin6
- serum9
- sieur6
- siren6
- smear8
- smerk12
- snafu10
- snare6
- sneer6
- snore6
- snuff13
- sperm11
- sprue9
- spume12
- spurn10
- stern6
- strum9
- suber9
- sucre9
- suers6
- super9
- surer6
- surfs9
- surfy11
- surge8
- syren8
- terms8
- terns6
- trues6
- tuner7
- tunes7
- turfs9
- turns7
- umber12
- unarm10
- under8
- unfed11
- unmet10
- unmew13
- unset7
- unsew10
- unsex14
- urase6
- ureas6
- urges8
- urine7
- ursae6
- users6
- usher8
- usnea7
- wrens9
- xerus13