4 letters
- spec10
- spic10
- spik11
- spin8
- spit7
- spiv11
- spud9
- spue8
- spun9
- spur8
- stum8
- stun6
- suba8
- such10
- suck12
- suit5
- sulk10
- sulu7
- sumo8
- sump11
- sums8
- sung8
- sunk10
- sunn7
- suns6
- supe8
- sups8
- sura5
- swam10
- swan8
- swap10
- swim10
- swum11
- syli7
- sync10
- tail5
- tain5
- talc8
- tali5
- tamp10
- tams7
- tans5
- taps7
- taus5
- tics7
- tils5
- tins5
- tipi7
- tips7
- tuis5
- tump11
- tuna6
- tuns6
- tups8
- ulan7
- ulna7
- ulus7
- ulva10
- umps11
- unai6
- unau7
- unci9
- unco9
- unit6
- upas8
- upon9
- uric8
- urns6
- ursa5
- utas5
- vacs11
- vail9
- vain9
- vamp14
- vans9
- vaus9
- vial9
- vims11
- vina9
- visa8
- wail8
- wain8
- wans8
- waps10
- wasp10
- waul9
- wimp13
- wins8
- wisp10
- yams9
- yaps9
- yaup10
- yins7
- yips9
- yuan8
- yuca10
- yups10
- zaps16
- zinc17
- zins14
- zips16