4 letters
- spud9
- spue8
- spun9
- spur8
- stay6
- stun6
- suba8
- sump11
- sung8
- sunk10
- sunn7
- suns6
- supe8
- sups8
- sura5
- swan8
- swap10
- sway9
- sync10
- syne7
- syph11
- tans5
- taps7
- taus5
- tuna6
- tuns6
- tups8
- ulan7
- ulna7
- umps11
- unai6
- unau7
- undy9
- upas8
- upby13
- upon9
- urns6
- ursa5
- utas5
- vans9
- vaus9
- wans8
- wany10
- waps10
- wasp10
- ways9
- wyns10
- yaks10
- yams9
- yang9
- yank11
- yaps9
- yarn7
- yaud8
- yaup10
- yawn10
- yawp12
- yaws9
- yays8
- yean7
- yeas6
- yens7
- yins7
- yips9
- yuan8
- yuca10
- yuga9
- yuks11
- yups10
- zany16
- zaps16