4 letters
- puts8
- quod15
- rhos6
- rhus7
- robs7
- rods5
- rood5
- root4
- roto4
- rots4
- rout5
- rubs8
- runs6
- runt6
- rush7
- rust5
- ruth7
- ruts5
- sand6
- scot7
- scud9
- scut8
- send6
- sent5
- shad7
- shat6
- shed7
- shin7
- shit6
- shmo9
- shod7
- shoe6
- shog8
- shoo6
- shop9
- shot6
- show9
- shul8
- shun8
- shut7
- sinh7
- sith6
- slob8
- slot5
- slub9
- slut6
- smut8
- sned6
- snib8
- snit5
- snob8
- snog7
- snot5
- snow8
- snub9
- snug8
- sobs7
- soda5
- sods5
- soft7
- sold6
- solo5
- sone5
- song7
- sons5
- sook8
- soon5
- soot4
- soph9
- sorb7
- sord5
- sorn5
- sort4
- soth6
- sots4
- souk9
- soul6
- soup8
- sour5
- sous5
- sown8
- spot7
- spud9
- spun9
- stab7
- stoa4
- stob7
- stop7
- stow7
- stub8
- stud6
- stum8
- stun6
- suba8
- subs8
- such10
- sudd7
- suds6
- sued6
- suet5
- sugh9
- suit5
- sulu7
- sumo8
- sung8
- sunk10
- sunn7
- suns6
- surd6
- swob10
- swot7
- sybo9
- tabs7
- tabu8
- tads5
- tans5
- taos4
- taus5
- teds5
- tend6
- tens5
- than7
- then7
- thin7
- thio6
- this6
- thou7
- thro6
- thru7
- thud8
- thug9
- thus7
- tins5
- toad5
- toby9
- tods5
- tody7
- toed5
- toes4
- tofu8
- togs6
- told6
- tolu6
- tomb10
- toms7
- tone5
- tong7
- tons5
- tony7
- took8
- tool5
- toom7
- toon5
- toot4
- toph9
- tops7
- torn5
- toro4
- tors4
- tosh6
- toss4
- tost4
- tots4
- tour5
- tout5
- town8
- tows7
- toyo6
- toys6
- trod5
- tuba8
- tube8
- tubs8
- tugs7
- tuis5
- tuna6
- tune6
- tung8
- tuns6
- tups8
- turd6
- turn6
- tush7
- tusk9
- tuts5
- tutu6
- twos7
- udos6
- ughs9
- ulus7
- umbo11
- unau7
- unbe9
- unco9
- unde7
- undo7
- undy9
- unit6
- unto6
- updo9