4 letters
- shin7
- ship9
- shul8
- shun8
- sial5
- sign7
- sild6
- silk9
- sill6
- silo5
- silt5
- sima7
- simp10
- sine5
- sing7
- sinh7
- sink9
- sins5
- sipe7
- sips7
- skin9
- skip11
- skua9
- slab8
- slag7
- slam8
- slap8
- slat5
- slaw8
- slay7
- slid6
- slim8
- slip8
- slit5
- slop8
- slub9
- slue6
- slug8
- slum9
- slur6
- slut6
- snag7
- snap8
- snaw8
- snib8
- snip8
- snit5
- snub9
- snug8
- soap7
- soil5
- sola5
- soli5
- soul6
- soup8
- spae7
- spam10
- span8
- spar7
- spas7
- spat7
- spay9
- spaz16
- spic10
- spik11
- spin8
- spit7
- spiv11
- spud9
- spue8
- spun9
- spur8
- stun6
- suba8
- suit5
- sulk10
- sulu7
- sump11
- sung8
- sunk10
- sunn7
- suns6
- supe8
- sups8
- sura5
- swan8
- swap10
- syli7
- tail5
- tain5
- tali5
- tans5
- taps7
- taus5
- tils5
- tins5
- tips7
- tuis5
- tuna6
- tuns6
- tups8
- ulan7
- ulna7
- ulus7
- ulva10
- umps11
- unai6
- unau7
- unci9
- unit6
- upas8
- upon9
- urns6
- ursa5
- urus6
- utas5
- vail9
- vain9
- vans9
- vaus9
- vial9
- vina9
- visa8
- wail8
- wain8
- wans8
- waps10
- wasp10
- waul9
- wins8
- wisp10
- yaps9
- yaup10
- yins7
- yips9
- yuan8
- yups10
- zaps16
- zins14
- zips16