4 letters
- puls9
- punk13
- puns9
- rubs8
- rums8
- runs6
- rusk9
- sall6
- sank9
- saul6
- scum11
- sell6
- shul8
- shun8
- silk9
- sill6
- sink9
- skim11
- skin9
- skua9
- slab8
- slam8
- slim8
- slob8
- slub9
- slue6
- slug8
- slum9
- slur6
- slut6
- smug10
- smut8
- snib8
- snob8
- snub9
- snug8
- souk9
- soul6
- spun9
- stub8
- stum8
- stun6
- suba8
- subs8
- suck12
- sulk10
- sulu7
- sumo8
- sump11
- sums8
- sung8
- sunk10
- sunn7
- suns6
- swum11
- tubs8
- tuns6
- tusk9
- ukes9
- ulan7
- ulna7
- ulus7
- umbo11
- umps11
- unau7
- unbe9
- urbs8
- urns6
- urus6
- yuks11