4 letters
- scup11
- scut8
- seal5
- seam7
- sell6
- sham9
- shmo9
- shul8
- shun8
- sial5
- sill6
- silo5
- sima7
- skua9
- slab8
- slag7
- slam8
- slap8
- slat5
- slaw8
- slay7
- slim8
- slob8
- sloe5
- slog7
- slop8
- slot5
- slow8
- slub9
- slue6
- slug8
- slum9
- slur6
- slut6
- smog9
- smug10
- smut8
- snag7
- snap8
- snaw8
- snob8
- snog7
- snot5
- snow8
- snub9
- snug8
- soak8
- soap7
- soar4
- sock11
- soda5
- sofa7
- soil5
- soja13
- sola5
- sold6
- sole5
- soli5
- solo5
- sols5
- soma7
- some7
- sone5
- song7
- sons5
- soon5
- sora4
- sorn5
- souk9
- soul6
- soup8
- sour5
- sous5
- sown8
- soya6
- spam10
- span8
- spun9
- stoa4
- stum8
- stun6
- suba8
- such10
- suck12
- sulk10
- sulu7
- sumo8
- sump11
- sums8
- sung8
- sunk10
- sunn7
- suns6
- sura5
- swam10
- swan8
- swum11
- sync10
- taco7
- talc8
- tall6
- tams7
- tans5
- taos4
- taus5
- tola5
- toll6
- tolu6
- toms7
- tons5
- tuna6
- tuns6
- udos6
- ulan7
- ulna7
- ulus7
- ulva10
- umbo11
- umps11
- unai6
- unau7
- unci9
- unco9
- undo7
- unto6
- upas8
- upon9
- urns6
- ursa5
- utas5
- vacs11
- vans9
- vaus9
- wall9
- wans8
- waul9
- wons8
- yams9
- yuan8
- yuca10