4 letters
- rust5
- ruth7
- ruts5
- sack11
- sacs7
- sank9
- sans5
- sark8
- scan8
- scar7
- scat7
- scot7
- scry9
- scud9
- scum11
- scup11
- scut8
- secs7
- sect7
- sent5
- sers4
- sets4
- shun8
- shut7
- sick11
- sics7
- sink9
- sins5
- sirs4
- sits4
- skas8
- skat8
- skin9
- skis8
- skit8
- skua9
- slur6
- slut6
- smut8
- snit5
- snot5
- snub9
- snug8
- sock11
- sons5
- sorn5
- sort4
- sots4
- souk9
- sour5
- sous5
- spun9
- spur8
- sris4
- star4
- stir4
- stub8
- stud6
- stum8
- stun6
- subs8
- such10
- suck12
- suds6
- suer5
- sues5
- suet5
- suit5
- sulk10
- sulu7
- sums8
- sung8
- sunk10
- sunn7
- suns6
- sups8
- suqs14
- sura5
- surd6
- sure5
- surf8
- suss5
- sync10
- tack11
- tank9
- tans5
- tarn5
- tars4
- task8
- tass4
- taus5
- tens5
- tern5
- thru7
- thus7
- tick11
- tics7
- tins5
- tons5
- torc7
- torn5
- tors4
- toss4
- tour5
- trek8
- true5
- trug7
- tsar4
- tsks8
- tubs8
- tuck12
- tugs7
- tuis5
- tuna6
- tune6
- tung8
- tuns6
- tups8
- turd6
- turf8
- turk9
- turn6
- tush7
- tusk9
- tuts5
- tutu6
- ukes9
- ulus7
- unau7
- unci9
- unco9
- unit6
- unto6
- urbs8
- urds6
- uric8
- urns6
- ursa5
- urus6
- user5
- uses5
- utas5
- wuss8
- yuck14
- yuks11
- yurt7