4 letters
- sigh8
- sign7
- sike8
- sild6
- silk9
- sill6
- silo5
- silt5
- sima7
- sine5
- sing7
- sinh7
- sink9
- sins5
- sipe7
- sire4
- sirs4
- site4
- sith6
- size13
- skin9
- skua9
- slab8
- slag7
- slam8
- slap8
- slat5
- slaw8
- slay7
- sled6
- slew8
- slid6
- slim8
- slip8
- slit5
- sloe5
- slub9
- slue6
- slug8
- slum9
- slur6
- slut6
- snag7
- snap8
- snaw8
- sned6
- snib8
- snip8
- snit5
- snub9
- snug8
- snye7
- soar4
- soil5
- sola5
- sole5
- soli5
- sone5
- sora4
- sore4
- sori4
- sorn5
- soul6
- sour5
- spae7
- span8
- spar7
- spin8
- spue8
- spun9
- spur8
- sris4
- star4
- stir4
- stun6
- suba8
- such10
- sued6
- suer5
- sues5
- suet5
- sugh9
- suit5
- sulk10
- sulu7
- sung8
- sunk10
- sunn7
- suns6
- supe8
- suqs14
- sura5
- surd6
- sure5
- surf8
- swan8
- syli7
- syne7
- tael5
- tahr6
- tail5
- tain5
- tale5
- tali5
- tans5
- tare4
- tarn5
- tars4
- taus5
- teal5
- tear4
- teas4
- tela5
- tels5
- tens5
- tern5
- thae6
- than7
- then7
- thin7
- thir6
- this6
- thru7
- thus7
- tier4
- ties4
- tile5
- tils5
- tine5
- tins5
- tire4
- tirl5
- true5
- tsar4
- tuis5
- tule6
- tuna6
- tune6
- tuns6
- turn6
- tush7
- ughs9
- ukes9
- ulan7
- ulna7
- ulus7
- ulva10
- unai6
- unau7
- unbe9
- unci9
- unde7
- unit6
- upas8
- urbs8
- urds6
- urea5
- urge7
- uric8
- urns6
- ursa5
- urus6
- used6
- user5
- uses5
- utas5
- uvea9
- vail9
- vain9
- vair8
- vale9
- vane9
- vans9
- vars8
- vase8
- vaus9
- veal9
- veil9
- vein9
- vela9
- vena9
- vera8
- vial9
- vier8
- vies8
- vile9
- vina9
- vine9
- virl9
- visa8
- vise8
- waes7
- wail8
- wain8
- wair7
- wale8
- wane8
- wans8
- ware7
- warn8