4 letters
- soul6
- soup8
- sour5
- sous5
- sown8
- sows7
- soya6
- spam10
- staw7
- stoa4
- stow7
- stum8
- suba8
- sumo8
- sump11
- sums8
- sura5
- swab10
- swag9
- swam10
- swan8
- swap10
- swat7
- sway9
- swim10
- swob10
- swop10
- swot7
- swum11
- tams7
- taos4
- taus5
- taws7
- toms7
- tows7
- twas7
- twos7
- udos6
- umbo11
- umps11
- upas8
- ursa5
- utas5
- vaus9
- vaws11
- vows11
- wabs10
- wads8
- waes7
- wags9
- wame10
- wans8
- waps10
- warm10
- wars7
- wash9
- wasp10
- wast7
- wats7
- wauk12
- waul9
- waur8
- waws10
- ways9
- wham12
- whoa9
- whom12
- woad8
- woes7
- wogs9
- woks11
- womb13
- wons8
- woos7
- wops10
- worm10
- wost7
- wots7
- wows10
- wuss8
- yams9
- yaws9
- yows9